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Iron Based Pnictide And Chalcogenide Superconductors Studied By Muon Spin Spectroscopy
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Book Synopsis Iron Based Pnictide and Chalcogenide Superconductors Studied by Muon Spin Spectroscopy by :
Download or read book Iron Based Pnictide and Chalcogenide Superconductors Studied by Muon Spin Spectroscopy written by and published by . This book was released on 2014 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Charge Dynamics in 122 Iron-Based Superconductors by : Aliaksei Charnukha
Download or read book Charge Dynamics in 122 Iron-Based Superconductors written by Aliaksei Charnukha and published by Springer Science & Business Media. This book was released on 2013-09-12 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis combines highly accurate optical spectroscopy data on the recently discovered iron-based high-temperature superconductors with an incisive theoretical analysis. Three outstanding results are reported: (1) The superconductivity-induced modification of the far-infrared conductivity of an iron arsenide with minimal chemical disorder is quantitatively described by means of a strong-coupling theory for spin fluctuation mediated Cooper pairing. The formalism developed in this thesis also describes prior spectroscopic data on more disordered compounds. (2) The same materials exhibit a sharp superconductivity-induced anomaly for photon energies around 2.5 eV, two orders of magnitude larger than the superconducting energy gap. The author provides a qualitative interpretation of this unprecedented observation, which is based on the multiband nature of the superconducting state. (3) The thesis also develops a comprehensive description of a superconducting, yet optically transparent iron chalcogenide compound. The author shows that this highly unusual behavior can be explained as a result of the nanoscopic coexistence of insulating and superconducting phases, and he uses a combination of two complementary experimental methods - scanning near-field optical microscopy and low-energy muon spin rotation - to directly image the phase coexistence and quantitatively determine the phase composition. These data have important implications for the interpretation of data from other experimental probes.
Book Synopsis The Superconducting and Magnetic Properties of the Iron-Chalcogenides by : Markus Bendele
Download or read book The Superconducting and Magnetic Properties of the Iron-Chalcogenides written by Markus Bendele and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2013 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is focused on the simplest of the iron-based high temperature superconductors, namely the binary iron chalcongenide family. Compared to the other families, it consists of a stack of FeCh layers only. It is considered an ideal modeling system for the other iron-based superconductors due to its simplicity and its similarity with their electronic structure. The electronic phase diagrams of the FeCh family contain the appearance of different ground states. Whereas the mother compounds are in general antiferromagnetically ordered, the material becomes superconducting after going through a region where superconductivity and magnetism coexist. In the framework of this book, the FeCh system was tuned solely by changing the lattice either by hydrostatic or chemical pressure and without introducing additional charge carriers. The muon spin rotation/relaxation/resonance technique in combination with ac and dc magnetization experiments is an ideal tool to investigate the superconducting and magnetic states and the interplay in a sense of competition and/or coexistence between them.
Book Synopsis Infrared Spectroscopy and Muon Spin Rotation Study of Superconductivity and Magnetism in Iron-based Superconductors by : Chennan Wang
Download or read book Infrared Spectroscopy and Muon Spin Rotation Study of Superconductivity and Magnetism in Iron-based Superconductors written by Chennan Wang and published by . This book was released on 2014 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Iron-based Superconductors by : Nan Lin Wang
Download or read book Iron-based Superconductors written by Nan Lin Wang and published by CRC Press. This book was released on 2012-11-19 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: From fundamental physics point of view, iron-based superconductors have properties that are more amenable to band structural calculations. This book reviews the progress made in this fascinating field. With contributions from leading experts, the book provides a guide to understanding materials, physical properties, and superconductivity mechanism
Book Synopsis The Iron Pnictide Superconductors by : Ferdinando Mancini
Download or read book The Iron Pnictide Superconductors written by Ferdinando Mancini and published by Springer. This book was released on 2017-05-25 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers different aspects of the physics of iron-based superconductors ranging from the theoretical, the numerical and computational to the experimental ones. It starts from the basic theory modeling many-body physics in Fe-superconductors and other multi-orbital materials and reaches up to the magnetic and Cooper pair fluctuations and nematic order. Finally, it offers a comprehensive overview of the most recent advancements in the experimental investigations of iron based superconductors.
Book Synopsis Muon Spin Relaxation and Rotation of Iron-based Superconductors by : Hemke Maeter
Download or read book Muon Spin Relaxation and Rotation of Iron-based Superconductors written by Hemke Maeter and published by . This book was released on 2012 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Iron Chalcogenide Superconductivity and Cobaltite Magnetism by : Yuefeng Nie
Download or read book A Study of Iron Chalcogenide Superconductivity and Cobaltite Magnetism written by Yuefeng Nie and published by . This book was released on 2011 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Understanding Iron-Pnictide Superconductors Using Muon Spin Rotation and Scanning Tunneling Microscopy with Nonconvex Optimization by : Sky Chance Cheung
Download or read book Understanding Iron-Pnictide Superconductors Using Muon Spin Rotation and Scanning Tunneling Microscopy with Nonconvex Optimization written by Sky Chance Cheung and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: These results place constraints on theoretical models that describe the local electronic structure and physics of NaFeAs.
Book Synopsis Spectroscopic Studies on Iron-chalcogenide Superconductors by : Ping-Hui Lin
Download or read book Spectroscopic Studies on Iron-chalcogenide Superconductors written by Ping-Hui Lin and published by . This book was released on 2011 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Studies of Iron Based Superconductors Using Spin-Fermion Models by : Christopher Brian Bishop
Download or read book Numerical Studies of Iron Based Superconductors Using Spin-Fermion Models written by Christopher Brian Bishop and published by . This book was released on 2017 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: The iron pnictide and iron chalchogenide superconductors are studied numerically using classical Monte Carlo techniques to reproduce experimental data and make predictions about the nature of the relevant interactions. The focus will be using Spin-Fermion models in a classical approximation to explore the phase diagram and calculate important physical properties of these materials over a wide range of temperatures.
Book Synopsis Ultrafast Dynamics of Superconducting Iron Chalcogenides Studied by Time-Resolved Spectroscopy by :
Download or read book Ultrafast Dynamics of Superconducting Iron Chalcogenides Studied by Time-Resolved Spectroscopy written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Spin-fluctuation Induced Superconductivity in Iron-based Superconductors by :
Download or read book Theory of Spin-fluctuation Induced Superconductivity in Iron-based Superconductors written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation we focus on the investigation of the pairing mechanism in the recently discovered high-temperature superconductor, iron pnictides. Due to the proximity to magnetic instability of the system, we considered short-range spin fluctuations as the major mediating source to induce superconductivity. Our calculation supports the magnetic fluctuations as a strong candidate that drives Cooper-pair formation in this material. We find the corresponding order parameter to be of the so-called ss-wave type and show its evolution with temperature as well as the capability of supporting high transition temperature up to several tens of Kelvin. On the other hand, our itinerant model calculation shows pronounced spin correlation at the observed antiferromagnetic ordering wave vector, indicating the underlying electronic structure in favor of antiferromagnetic state. Therefore, the electronic degrees of freedom could participate both in the magnetic and in the superconducting properties. Our work shows that the interplay between magnetism and superconductivity plays an important role to the understanding of the rich physics in this material. The magnetic-excitation spectrum carries important information on the nature of magnetism and the characteristics of superconductivity. We analyze the spin excitation spectrum in the normal and superconducting states of iron pnictides in the magnetic scenario. As a consequence of the sign-reversed gap structure obtained in the above, a spin resonance mode appears below the superconducting transition temperature. The calculated resonance energy, scaled with the gap magnitude and the magnetic correlation length, agrees well with the inelastic neutron scattering (INS) measurements. More interestingly, we find a common feature of those short-range spin fluctuations that are capable of inducing a fully gapped ss state is the momentum anisotropy with elongated span along the direction transverse to the antiferromagnetic momentum transfer. This calculated intrinsic anisotropy exists both in the normal and in the superconducting state, which naturally explains the elliptically shaped magnetic responses observed in INS experiments. Our detailed calculation further shows that the magnetic resonance mode exhibits an upward dispersion-relation pattern but anisotropic along the transverse and longitudinal directions. We also perform a qualitative analysis on the relationship between the anisotropic momentum structure of the magnetic fluctuations and the stability of superconducting phase by intraorbital but interband pair scattering to show the consistency of the magnetic mechanism for superconductivity. As discussed for cuprates, an important identification of the mediating boson is from the fermionic spectrum. We study the spectral function in the normal and superconducting state. Not only do we extract the gap magnitude on the electron- and hole-pockets to show the momentum structure of the gap, but also find a peak-dip-hump feature in the electron spectrum, which reflects the feedback from the spin excitations on fermions. This serves as an interpretation of the kink structure observed in ARPES measurements.
Book Synopsis Scanning Tunneling Spectroscopy Studies of Multiband and Unconventional Superconductivity by : Igor Fridman
Download or read book Scanning Tunneling Spectroscopy Studies of Multiband and Unconventional Superconductivity written by Igor Fridman and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Interplay of Structure, Magnetism and Superconductivity in CaRE112 and 10-3-8 Fe-Pnictide Superconducting Families by : Shan Jiang
Download or read book The Interplay of Structure, Magnetism and Superconductivity in CaRE112 and 10-3-8 Fe-Pnictide Superconducting Families written by Shan Jiang and published by . This book was released on 2017 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the discovery of superconductivity in an Fe pnictide compound (LaFeAsO) in 2008, many other Fe-based superconductors were discovered with Tc as high as 56 K. Among them, the most extensive studies were carried out on the so called 122 system (AeFe2As2, Ae=Ba, Sr and Ca), because of the availability of large, high-quality single crystals. A recurring theme from these works is the rich interplay between antiferromagnetic and su- perconducting orders, and their relationship to structure and so-called electronic nematic instabilities. The research described here exploits two compounds with new and nontrivial crystal structures to open a new perspective on the important physics of the FBS. Two newly discovered members of the FBS family, Ca1 xRExFeAs2 (CaRE112) and Ca10Pt3As8(Fe2As2)5 (10-3-8), possess intriguing structural characteristics and electronic band properties. As one of the most anisotropic FBSs, the critical temperature in the 10- 3-8 family can be induced up to 35 K by appropriate doping/external pressure while the CaRE112 compound can be doped into superconductors up to 47 K. They possess nontriv- ial structural and chemical characteristics. Firstly, structurally, unlike the other intensively studied pnictides which crystalize in tetragonal structure, 10-3-8 crystallizes in a triclinic structure. However, the "magic" FeAs layer, which is proposed to play a crucial role in mediating superconductivity, still maintains the local C4 rotational symmetry. On the other hand, CaRE112 has monoclinic structure at room temperature. However, owing to a unique spacer layer consisting of zigzag As chains in the crystal structure, FeAs layer loses its local C4 rotational symmetry even at room temperature, which is very unique in all FBSs. Sec- ondly, the nature of the spacer layers in 10-3-8 and CaRE112 are quite different from each other. The 10-3-8 family has the skutterudite Pt3As8 layer as the spacer layer, which can be assigned with integer number of oxidization states, thus the spacer layer will not con- tribute density of states at the Fermi level. On the other hand, the CaRE112 family has the zigzag chains as its spacer layer, which can not be assigned with integer oxidization states and contributes significant amount of density of states at the Fermi level. The fact that these two systems have similar FeAs interlayer distance but quite distinct characteristics of their spacer layers make them great systems to study the effect of the interlayer coupling on competing orders in FBSs. In this thesis, I present a systematic experimental study, from synthesis to characteriza- tion, for both materials. I make combined transport, thermodynamic, neutron scattering, and muon spin relaxation measurements to investigate the interplay of competing orders and elaborate the role of the interlayer coupling on these competing orders. It has been reported previously that Ca10Pt3As8(Fe2As2)5, the parent compound of the 10-3-8 family, shows structural/magnetic instabilities. By substituting Co on Fe sites in the 10-3-8 family, the structural/magnetic phase transitions are suppressed and superconductivity up to 13.5 K is stabilized in an extended dome-like region in the temperature-dopant concentration phase diagram. More importantly, we demonstrate that within our experimental resolu- tion, no phase coexistence of antiferromagnetism and superconductivity exists in Co doped 10-3-8. Our research on the CaRE112 (RE = La, Ce, Pr, Nd) system is pioneering. Our refined synthesis recipes make us the first group to grow sizable CaRE112 single crystals with controlled doping. We identify the parent phase of the CaLa112 system, in which a monoclinic to triclinic structural phase transition and a paramagnetic to stripe-like antifer- romagnetic phase transitions are clearly evidenced. In addition, the metallic nature of its spacer layers is demonstrated. By Co doping on the Fe sites in CaLa112, we suppress the structural/magnetic phase transitions and induce superconductivity up to 20 K in a dome shaped region in the temperature-dopant concentration phase diagram. Our measurements of the superconducting and magnetic volume fractions show that these two phases coexist microscopically in the underdoped region, in contrast to the Co doped 10-3-8 compound, where coexistence is absent. Supported by model calculations, we discuss the differences in the phase diagrams of the 112 and 10-3-8 compounds in terms of the FeAs interlayer coupling, whose strength is affected by the character of the spacer layer, which is metallic in the 112 and insulating in the 10-3-8. Finally, we extend the discussion from CaLa112 to CaRE112 (RE = Ce, Pr, Nd). The structural and magnetic phase transitions of the FeAs layer are revealed in Ca0.71RE0.29FeAs2 (RE = Ce, Pr, Nd). Using Ca0.71Ce0.29FeAs2 as a representative, we demonstrate that an antiferromagentic ordering of Ce strongly entangled with the Fe moments develops at low temperatures. When Co is doped on the Fe sites in Ca0.71Ce0.29FeAs2, we show although Co doping suppresses the magnetic/structural ordering of the FeAs layer, it has little effect on the Ce ordering. We argue the lack of bulk super- conductivity in Co-doped Ca0.71Ce0.29FeAs2 arises from the excess electron doping of FeAs layer.
Book Synopsis Journal of the Physical Society of Japan by :
Download or read book Journal of the Physical Society of Japan written by and published by . This book was released on 2014 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Muon Science written by S.L Lee and published by CRC Press. This book was released on 1999-01-01 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: Muon science is rapidly assuming a central role in scientific and technological studies of the solid state within the disciplines of physics, chemistry, and materials science. Muon Science: Muons in Physics, Chemistry and Materials presents key developments in both theoretical and experimental aspects of muon spin relaxation, rotation, and resonance. Assuming no prior expertise in muon science, the book guides readers from introductory material to the latest developments in the field. The internationally renowned expert contributors cover topics in muon instrumentation and muon science applications that include muon production, beamlines and instrumentation, muonium chemistry, muon catalyzed fusion, fundamental muon physics, ultra-cold muons, magnetism, superconductivity, diffusion, semiconductors, simulations, and data analysis. The book maintains consistent notation and nomenclature throughout as well as cross-referencing and continuity between the contributions. It provides an excellent introduction to both new and experienced muon beam scientists and graduate students wishing to develop their knowledge and understanding of the subject.