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Magnetism In Heavy Fermion Systems
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Book Synopsis Magnetism in Heavy Fermion Systems by : Harry Brian Radousky
Download or read book Magnetism in Heavy Fermion Systems written by Harry Brian Radousky and published by World Scientific. This book was released on 2000 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetism in Heavy Fermion Systems is a review volume which covers an important subset of topics in the field of heavy fermion and non-Fermi liquid physics. It summarizes much of the experimental information in these areas, and includes an article which discusses theoretical interpretations of the complex magnetic behavior of heavy fermion systems. The topics covered include heavy fermion superconductivity, muon spin relaxation in small-moment heavy fermions, neutron scattering from heavy fermions, random localized magnetism in heavy fermions, and magnetism in Pr-containing cuprates. One feature of the book which should be helpful to graduate students and new workers in the field is the extensive references and a separate list of review articles.
Book Synopsis Heavy-Fermion Systems by : Prasanta Misra
Download or read book Heavy-Fermion Systems written by Prasanta Misra and published by Elsevier. This book was released on 2007-12-11 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book on Heavy-Fermion Systems is a part of the Book series "Handbook of Metal Physics", each volume of which is written to facilitate the research of Ph.D. students, faculty and other researchers in a specific area. The Heavy-Fermions (sometimes known as Heavy-Electrons) is a loosely defined collection of intermetallic compounds containing rare-earth (mostly Ce) or actinide (mostly U) elements. These unusual names were given due to the large effective mass (100-1,000 times greater than the mass of a free electron) below a critical temperature. They have a variety of ground states including superconducting, antiferromagnetic, paramagnetic or semiconducting. Some display unusual magnetic properties such as magnetic quantum critical point and metamagnetism. This book is essentially a summary as well as a critical review of the theoretical and experimental work done on Heavy Fermions. · Extensive research references. · Comprehensive review of a very rapidly growing number of theories. · Summary of all important experiments. · Comparison with other highly correlated systems such as High-Tc Superconductors. · Possible Technological applications.
Book Synopsis Physics Of Heavy Fermions: Heavy Fermions And Strongly Correlated Electrons Systems by : Yoshichika Onuki
Download or read book Physics Of Heavy Fermions: Heavy Fermions And Strongly Correlated Electrons Systems written by Yoshichika Onuki and published by World Scientific. This book was released on 2018-04-26 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large variety of materials prove to be fascinating in solid state and condensed matter physics. New materials create new physics, which is spearheaded by the international experimental expert, Prof Yoshichika Onuki. Among them, the f electrons of rare earth and actinide compounds typically exhibit a variety of characteristic properties, including spin and charge orderings, spin and valence fluctuations, heavy fermions, and anisotropic superconductivity. These are mainly manifestations of better competitive phenomena between the RKKY interaction and the Kondo effect. The present text is written so as to understand these phenomena and the research they prompt. For example, superconductivity was once regarded as one of the more well-understood many-body problems. However, it is, in fact, still an exciting phenomenon in new materials. Additionally, magnetism and superconductivity interplay strongly in heavy fermion superconductors. The understanding of anisotropic superconductivity and magnetism is a challenging problem in solid state and condensed matter physics. This book will tackle all these topics and more.
Download or read book Magnetism written by Gupta L C and published by World Scientific. This book was released on 1993-03-24 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Spin Fluctuations in Heisenberg Magnets: Dynamic Critical Phenomena and Excitations in Quasi-Periodic Systems (S W Lovesey)Quenching of Spin Fluctuations by High Magnetic Fields (K Ikeda et al.)Kondo Effect and Heavy Fermions (B Coqblin et al.)Magnetic Interactions in Correlated Electron Systems: High Pressure Investigations (J D Thompson)Hall Effect in Heavy Fermion and Mixed Valence Systems (A Hamzić & A Fert)Magnetic Properties of Uranium Based 1-2-2 Intermetallics (T Endstra et al.)Inelastic Magnetic Excitations in Anomalous Rare Earth Intermetallics (E Holland-Moritz)Neutron Scattering Studies of Magnetic Properties of Actinide Systems (G H Lander & G Aeppli)Magnetic Properties of Heavy Fermion Systems — As Studied by μSR-Spectroscopy (A Schenck)Re-Entrant Spin-Glasses: Do They Exist? (B R Coles & S B Roy)Insulating Spin Glass Systems (J K Srivastava)Nuclear Magnetism in Metals and Alloys (S Ramakrishnan & G Chandra) Readership: Solid-state physicists and chemists. keywords:
Book Synopsis Magnetism in Yb- and Ce-based heavy-fermion metals under pressure by : Monica Elena Macovei
Download or read book Magnetism in Yb- and Ce-based heavy-fermion metals under pressure written by Monica Elena Macovei and published by Cuvillier Verlag. This book was released on 2011-01-14 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than 30 years the investigation of heavy-fermion (HF) metals has been one of the most fascinating and interesting fields in condensed matter physics both experimentally and theoretically. The HF phenomenon is observed in compounds containing rare-earth elements such as, e.g., Ce or Yb. The ground-state properties of these systems is considered to result from a competition between the Kondo effect and the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. The Kondo effect induces a screening of the local 4f moments by the conduction electrons and, thus, favors a nonmagnetic ground state. By contrast, the indirect RKKY interaction promotes a magnetic ordering of the local moments. Therefore, depending on the strength of these interactions, the ground state of a HF compound ranges from paramagnetic (PM) to magnetically ordered. Even interplay between magnetism and superconductivity is observed in some materials. High-pressure experiments are of particular interest because for a given system the ground state can be tuned by external pressure (p). In the case of Yb-based Kondo-lattice systems, pressure stabilizes the magnetic state, while for Ce-based Kondo-lattice compounds pressure favors a non-magnetic ground state. Therefore, pressure is an ideal tool to tune a HF material through a zero-temperature magnetic instability in order to study quantum critical behavior in its vicinity. The present thesis addresses the effect of pressure, magnetic field, and temperature on the properties of the rare-earth compounds Yb(Rh0.94Ir0.06)2Si2, YbIr2Si2, and CeRuPO. Electrical resistivity measurements under pressure have been performed in order to investigate the evolution of the ground-state properties and to search for the putative QCP supposed to exist in the studied HF materials. At atmospheric pressure, Yb(Rh0.94Ir0.06)2Si2 does not order down to 20mK. Applying a small pressure, AFM order is observed at low temperatures. Upon further increasing pressure, the magnetic transition temperature increases, and a second magnetic transition appears inside the ordered state. The electrical resistivity measurements under pressure suggest that, at ambient pressure, Yb(Rh0.94Ir0.06)2Si2 orders slightly below 20 mK. The T- p phase diagram of Yb(Rh0.94Ir0.06)2Si2 and of YbRh2Si2 can be superposed by shifting the pressure axis of Yb(Rh0.94Ir0.06)2Si2 by ?p = -0.06 GPa. The electrical resistivity studies indicate that in Yb(Rh0.94Ir0.06)2Si2, Ir substitution acts primarily as negative chemical pressure and disorder effects play only a minor role. The results point at the existence of a pressure (volume) controlled quantum critical point (QCP) at a hypothetical negative critical pressure of pc = -0.25GPa. The ambient-pressure thermodynamic and transport properties of YbRh2Si2 reveal a PM ground state, in contrast to the Rh-homolog which possesses a magnetic ground state being situated in the direct vicinity to an AFM QCP. Application of pressure on YbRh2Si2 is expected to tune the system through a QCP, providing a unique opportunity to investigate the physical properties at and around a pressure (volume) controlled magnetic QCP in a clean stoichiometric Yb system. The Landau Fermi-liquid (LFL) state observed at low temperatures at ambient pressure survives in the pressure range up to pLFLc ÷ 3 GPa. With further increasing pressure, the resistivity shows a temperature dependence weaker than quadratic. This, so-called, non Fermi-liquid (NFL) behavior observed down to the lowest temperatures extends up to the critical pressure, pc ÷ 8 GPa, where magnetic order sets in. This broad region of NFL behavior might reveal the existence of a novel type of metallic phase. The magnetic order develops suddenly hinting at a first-order transition at pc. With further increasing pressure, the magnetic state is stabilized. The high-T resistivity studies allow to determine the pressure evolution of the Kondo and crystalline electric field (CEF) energy scales. In the PM region, the CEF splitting is independent of p, while TK decreases exponentially in the same pressure range. At about the critical pressure, a low-lying Kondo scale and the excited CEF levels at higher temperatures can be clearly resolved. At ambient pressure CeRuPO is a FM Kondo-lattice system with TC = 14 K and TK ÷ 10 K. So far, the behavior at a FM QCP in a Kondo-lattice system is not settled. Therefore, pressure studies on CeRuPO offer the great opportunity to investigate the suppression of FM order in a Ce-based Kondo-lattice system. Upon applying pressure the magnetic ordering temperature in CeRuPO shifts toward lower temperatures. Furthermore, the ground state of CeRuPO changes from FM to AFM order at p* ÷ (0.87 ö 1.01) GPa. Our results indicate a critical pressure of pc ÷ 3 GPa where the magnetic transition temperature is suppressed to zero temperature in a first-order like way. Therefore, we come to the conclusion that a magnetic QCP does not exist in CeRuPO. Beyond pc, LFL behavior was observed at low temperatures, in support of our previous conclusion. The pressure evolution of the high-T electrical resistivity cannot be understood in a simple picture for a Ce-based HF metal considering a dominant Kondo energy scale. At low pressures, the temperature dependence of the resistivity above the magnetic transition is strongly affected by the Kondo effect, magnetic fluctuations, and CEF splitting. At higher pressures, the contribution to ?(T) from Kondo scattering on the ground state and on excited CEF levels can be separated. Our study indicates that CeRuPO is a further example of a FM system in which application of pressure suppresses the magnetic order, but also destabilizes FM order in favour of an AFM one, preventing the appearance of a FM QCP.
Book Synopsis The Kondo Problem to Heavy Fermions by : Alexander Cyril Hewson
Download or read book The Kondo Problem to Heavy Fermions written by Alexander Cyril Hewson and published by Cambridge University Press. This book was released on 1997-04-28 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behaviour of magnetic impurities in metals has posed problems to challenge the condensed matter theorist over the past 30 years. This book deals with the concepts and techniques which have been developed to meet this challenge, and with their application to the interpretation of experiments. This book will be of interest to condensed matter physicists, particularly those interested in strong correlation problems. The detailed discussions of advanced many-body techniques should make it of interest to theoretical physicists in general.
Book Synopsis Probing the Magnetism in the CEMIN_5 Heavy Fermion Systems by NMR. by :
Download or read book Probing the Magnetism in the CEMIN_5 Heavy Fermion Systems by NMR. written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Superconductivity, Magnetism and Non-fermi-liquid Behavior in Heavy-fermion Systems by : Vivien Stefanie Zapf
Download or read book Superconductivity, Magnetism and Non-fermi-liquid Behavior in Heavy-fermion Systems written by Vivien Stefanie Zapf and published by . This book was released on 2003 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Magnetism of Heavy-Fermion Metals by : William Knafo
Download or read book Magnetism of Heavy-Fermion Metals written by William Knafo and published by . This book was released on 2023-05-30 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Correlated-electron systems offer a unique playground for discovering and studying new quantum states of matter, at the crossway between itinerant quantum magnetism and unconventional superconductivity. The understanding of their basic properties, although needing experimental environments which cannot be transposed at industrial scales, will surely benefit within mid- and long-term perspectives to future revolutionary applications in the domains of applied physics, micro and nano-electronics, energetics.As textbook examples of quantum magnets and unconventional superconductors, heavy-fermion compounds offer a fertile ground for testing new concepts in condensed matter. Quantum magnetic phase transitions can be easily tuned experimentally, leading to a large variety of electronic ground states, from a heavy Fermi liquid to long-range magnetic-order and unconventional superconducting phases. This book written by William Knafo, an expert in correlated-electron physics, proposes a systematic and thorough review on the experimental advances in the study of magnetism in heavy-fermion metals over the last decades. The phase diagrams of these quantum materials under multiple sets of tuning parameters, the questions of the dual localized-itinerant nature of the f-electrons and of the critical role of magnetic fluctuations, in relation with nearby quantum magnetic phase transitions and the stabilization of superconductivity, are carefully addressed.
Book Synopsis Superconductivity and Magnetism in Selected Filled Skutterudites and Heavy Fermion Systems by : Ram Bahadur Adhikari
Download or read book Superconductivity and Magnetism in Selected Filled Skutterudites and Heavy Fermion Systems written by Ram Bahadur Adhikari and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strongly correlated electron systems constitute a rich reservoir for interesting physical phenomena. The competition and interplay between the localized magnetic moments in partially filled d or f electron systems and the itinerant conduction electrons states lead to novel phenomena such as complex magnetic properties, unconventional superconductivity, non-Fermi-liquid behavior, and the coexistence of superconductivity and magnetism. Such intriguing physical phenomena can be achieved by tuning the system with a control parameter, such as chemical composition, applied pressure, and magnetic field. It is interesting to study the chemical substitution effects on the correlated f electron system along with magnetic field to explore their complex phase diagram. This dissertation work focuses on experimental studies of the Ce and Eu substituted filled skutterudite system PrPt4Ge12 over a wide range of doping, magnetic field, and temperature using heat capacity measurements. The first study will focus on the specific heat and electrical resistivity measurements performed on the Pr[subscript 1-x]Ce[subscript x]Pt4Ge12 crystals. We have found that Ce monotonically suppresses the superconducting transition temperature T[subscript c] and a small Ce concentration of x = 0.14 brings the T[subscript c] to as low as 0.6 K. We further have demonstrate that small Ce substitution does not affect the multiband nature of superconductivity seen previously in the parent compound PrPt4Ge12. On the other hand, our data provide evidence that one of the two gaps is nodal in the parent compound and that Ce substitution gradually suppresses the value of the nodal gap. To understand the possible interplay between superconductivity and magnetism, we study the same parent system PrPt4Ge12, this time substituting Pr with europium. The compound so formed is Pr[subscript 1-x]Eu[subscript x]Pt4Ge12 whose end members are superconductor (x = 0) and antiferromagnetic (x = 1) at lower temperatures, so that there is the possibility of interaction between superconductivity and magnetism in the intermediate doping range. The increase of Eu concentration leads to a suppression of the superconducting transition temperature as in the case of cerium substitution. There is a low temperature heat capacity anomaly present over the whole doping range. Our analysis of the heat capacity data shows that in alloys with x = 0.5 the Schottky peaks in the heat capacity in the superconducting state appear to be due to Zeeman splitting by an internal magnetic field. Our theoretical analysis suggests that this internal magnetic field is a result of short-range antiferromagnetic correlations between the europium ions. We further investigated the effect of Eu substitution on the Pr site through heat capacity measurements on the same system in an applied magnetic field. The low temperature heat capacity peaks seen in the samples with x
Book Synopsis Selected Topics in Magnetism by : L. C. Gupta
Download or read book Selected Topics in Magnetism written by L. C. Gupta and published by World Scientific. This book was released on 1993 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Antiferromagnetism and Superconductivity in Ce-based Heavy-Fermion Systems by : Edit Lengyel
Download or read book Antiferromagnetism and Superconductivity in Ce-based Heavy-Fermion Systems written by Edit Lengyel and published by Cuvillier Verlag. This book was released on 2008 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interplay of superconductivity and magnetism in heavy-fermion systems by : Ralf Feyerherm
Download or read book Interplay of superconductivity and magnetism in heavy-fermion systems written by Ralf Feyerherm and published by . This book was released on 1995 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermodynamic Characterization of Heavy Fermion Systems and Low Dimensional Quantum Magnets Near a Quantum Critical Point by :
Download or read book Thermodynamic Characterization of Heavy Fermion Systems and Low Dimensional Quantum Magnets Near a Quantum Critical Point written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report experimentally results on the low temperature properties of two classes of materials with a special emphasizes near the QCP induced by substitution and magnetic 1.field: (1) the HF systems YbRh2(Si0.95Ge0.05)2, Yb1-yLayRh2Si2 (y = 0.05, 0.1), and YbIr2Si2 with tetragonal structures and CeIn3-xSnx (x = 0.55, 0.6, 0.65, 0.7, 0.8) with cubic structure; (2) the quantum spin systems: Cs2CuCl4 and Cs2CoCl4. In all the HF compounds we have observed NFL behavior in zero magnetic field close to the QCP. The La substituted system does not show an antiferromagnetic (AFM) transition down to the lowest accessible temperature (0.03 K) while in YbRh2(Si1-xGex)2 with x = 0 and x = 0.05 AFM transitions occur at TN =0.07 K and 0.02 K, respectively. For Yb0.9La0.1Rh2Si2 we observe below 0.07 K saturation of DeltaC/T indicating clearly a LFL state for this concentration. For YbIr2Si2, DeltaC/T saturates below 0.5 K. In contrast to the Yb based compounds in the vicinity of the QCP, CeIn3-xSnx shows no evidence of a divergence in Delta C/T, with B or with x. Furthermore, we used specic heat measurements in the mK temperature range and at high fields (up to 12 T) to probe the phase diagrams in the low dimensional quantum antiferromagnets Cs2CuCl4 and Cs2CoCl4. In applied magnetic field, we have presented experimental evidence that in Cs2CuCl4 the field dependence of the critical temperature Tc(B) ~ (Bc-B)^1-Phi close to the critical field Bc = 8.51 T is well described with Phi=1.5. This is in very good agreement with the exponent expected in the mean-field approximation and support the notion of a Bose-Einstein condensation of magnons in Cs2CuCl4.
Book Synopsis Lecture Notes On Electron Correlation And Magnetism by : Patrik Fazekas
Download or read book Lecture Notes On Electron Correlation And Magnetism written by Patrik Fazekas and published by World Scientific. This book was released on 1999-01-25 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume attempts to fill the gap between standard introductions to solid state physics, and textbooks which give a sophisticated treatment of strongly correlated systems. Starting with the basics of the microscopic theory of magnetism, one proceeds with relatively elementary arguments to such topics of current interest as the Mott transition, heavy fermions, and quantum magnetism. The basic approach is that magnetism is one of the manifestations of electron-electron interaction, and its treatment should be part of a general discussion of electron correlation effects.Though the text is primarily theoretical, a large number of illustrative examples are brought from the experimental literature. There are many problems, with detailed solutions.The book is based on the material of lectures given at the Diploma Course of the International Center for Theoretical Physics, Trieste, and later at the Technical University and the R. Eötvös University of Budapest, Hungary.
Book Synopsis 30 Years of the Landau Institute by : Isaak Markovich Khalatnikov
Download or read book 30 Years of the Landau Institute written by Isaak Markovich Khalatnikov and published by World Scientific. This book was released on 1996 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Landau Institute for Theoretical Physics was created in 1965 by a group of LD Landau's pupils. Very soon, it was widely recognized as one of the world's leading centers in theoretical physics. According to Science Magazine, the Institute in the eighties had the highest citation index among all the scientific organizations in the former Soviet Union. This collection of the best papers of the Institute reflects the development of the many directions in the exact sciences during the last 30 years. The reader can find the original formulations of well-known notions in condensed matter theory, quantum field theory, mathematical physics and astrophysics, which were introduced by members of the Landau Institute.The following are some of the achievements described in this book: monopoles (A Polyakov), instantons (A Belavin et al.), weak crystallization (S Brazovskii), spin superfluidity (I Fomin), finite band potentials (S Novikov) and paraconductivity (A Larkin, L Aslamasov).
Book Synopsis ELECTRON-PHONON INTERACTION AND ITS EFFECTS IN HEAVY FERMION SYSTEMS by : Dr. Jitendra Sahoo
Download or read book ELECTRON-PHONON INTERACTION AND ITS EFFECTS IN HEAVY FERMION SYSTEMS written by Dr. Jitendra Sahoo and published by Newredmars Education Pvt Ltd. This book was released on 2022-06-25 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: The story of heavy fermions (HF) begun with the discovery of the low temperature behaviour of CeAl3 by Andres et al. in the year 1975 took the momentum after the discovery of superconductivity in CeCu2Si2 by Steglich et al. in the year 1979 . Though HF behaviour is common in the rare-earth elements like Ce, Yb and actinides like U, it is also found to exist in some of the praseodymium (Pr), samarium (Sm) , plutonium (Pu) and more recently in neptunium (Np) systems. These compounds are characterized by the presence of partially filled f-electron bands. At high temperatures, these magnetic moments manifest themselves as a weakly interacting set of local moments of the f electrons with Curie-Weiss susceptibility that coexists with light s or d conduction electrons. But at low temperature, these f-electrons hybridize with conduction electrons near Fermi level via Kondo spin fluctuation which happens through constant exchange spin-flip transition of f-electrons and band electrons in the vicinity of Fermi level. This process leads to a strong mixing of Fermi electrons with the localized f-electrons which is manifested in a renormalization of the Fermi surface and a drastic enhancement of the effective mass of the electrons at Fermi level. Further, in HF systems, electron-phonon interaction (EPI) contributes a lot in manifestation of some of the anomalous behaviour relating to elastic constant, ultrasonic attenuation & sound velocity, anisotropic Fermi surface, Kondo volume collapse etc. In this PhD thesis book in title “Electron phonon interaction and its effect in heavy fermion (HF) systems” the author tries to put some light into the behavoiour of Electron-phonon interaction in describing some of the properties of HF systems at low temperatures. In this 1 st edition, the book has been presented in multicolour edition with profuse colour illustrations so as to increase its clarity, understand ability and legibility, especially of the figures depicted to explain the low temperature behaviour of HF systems. It is hoped that the present book will serve its purpose in attracting young researchers to the field of HF systems. It is my foremost duty to express my deep sense of gratitute to my supervisor Dr. Pratibindhya Nayak , Professor Emeritus, School of Physics, Sambalpur University, Odisha, for his able guidance at every stage of this work.. His innovative methods and inspirational guidance have largely contributed to the conceptualization of the form and content of this book. I am indebted to my family members for their constant support. I am sincerely thankful to the publisher, Newredmars Education to bring my works into light in form of a book Healthy criticism and suggestions for further improvement of the book are solicited.
