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Author : Kemp William Plumb
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Inelastic Neutron Scattering Studies of Novel Quantum Magnets written by Kemp William Plumb and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 203 pages
Book Rating : 4.:/5 (718 download)
Download or read book Neutron Scattering in the Novel Quantum Magnets written by and published by . This book was released on 2006 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behavior of magnetic systems in the extreme quantum limit is one of the most interesting forefront areas in condensed matter physics. This dissertation investigates two particularly interesting quantum magnets: LiVO2 and DMACuCl3. Systematic studies were performed on single crystal samples using different experimental techniques, especially inelastic neutron scattering. Detailed experimental results and corresponding model calculations are presented and discussed in this dissertation. LiVO2 is a good candidate to study the interplay between ʺmagnetic frustrationʺ and orbital ordering. V3+ ions in LiVO2 form a triangular lattice involving threefold degenerate t2g orbitals. LiVO2 undergoes a first order phase transition at Tt = 500 K accompanied by a large reduction of the magnetic susceptibility in the low temperature phase. The origin of this phase transition has been associated with a peculiar type of t2g orbital ordering resulting in the formation of vanadium trimer clusters with a spin-singlet ground state. Our inelastic neutron scattering experiments reveal multiple magnetic excitations with energy transfer as large as several hundreds of meV associated with the low temperature orbitally ordered phase. This can not be explained by a simple ʺspin-onlyʺ isolated trimer model. Model calculations including a Kugel-Khomskii orbital-ordering term yield qualitatively similar spectra suggesting that a new type of excitation, which we refer to as ʺcluster orbitonʺ, has been observed in LiVO2. DMACuCl3 was proposed as a S = 1/2 FM-AFM alternating-sign chain along the a-axis. However, our inelastic neutron scattering experiments indicate that the strong magnetic coupling in DMACuCl3 is along the b-axis, and the magnetic excitation spectrum is dominated by the FM-AFM alternating chain with J (subscript FM) = -1.2(1) meV and J(subscript AFM) = 1.3(2) meV. Furthermore, recent studies show that DMACuCl3 undergoes a structural phase transition at Tt = 285 K. Below T(subscript t), the low temperature crystal structure suggests that DMACuCl3 contains two types of dimers: FM and AFM dimers. Inelastic neutron scattering results suggest a two chain model along the b-axis for DMACuCl3. This research is conducted under the supervision of the authorʹs advisors: Dr. David G. Mandrus at material science and technology division and Dr. Stephen E. Nagler at center for neutron scattering, Oak Ridge National Laboratory.
Author : Chiron Jeeb Mukherjee
Publisher :
ISBN 13 :
Total Pages : 418 pages
Book Rating : 4.:/5 (749 download)
Download or read book Neutron Scattering Studies on Low-dimensional Quantum Magnets written by Chiron Jeeb Mukherjee and published by . This book was released on 2005 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Macdougal
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book Neutron Scattering Studies of Low-dimensional Quantum Magnets written by David Macdougal and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher : Elsevier
ISBN 13 : 0128020938
Total Pages : 534 pages
Book Rating : 4.1/5 (28 download)
Download or read book Neutron Scattering - Magnetic and Quantum Phenomena written by and published by Elsevier. This book was released on 2015-11-29 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron Scattering - Magnetic and Quantum Phenomena provides detailed coverage of the application of neutron scattering in condensed matter research. The book's primary aim is to enable researchers in a particular area to identify the aspects of their work where neutron scattering techniques might contribute, conceive the important experiments to be done, assess what is required to carry them out, write a successful proposal for one of the major user facilities, and perform the experiments under the guidance of the appropriate instrument scientist. An earlier series edited by Kurt Sköld and David L. Price, and published in the 1980s by Academic Press as three volumes in the series Methods of Experimental Physics, was very successful and remained the standard reference in the field for several years. This present work has similar goals, taking into account the advances in experimental techniques over the past quarter-century, for example, neutron reflectivity and spin-echo spectroscopy, and techniques for probing the dynamics of complex materials of technological relevance. This volume complements Price and Fernandez-Alonso (Eds.), Neutron Scattering - Fundamentals published in November 2013. Covers the application of neutron scattering techniques in the study of quantum and magnetic phenomena, including superconductivity, multiferroics, and nanomagnetism Presents up-to-date reviews of recent results, aimed at enabling the reader to identify new opportunities and plan neutron scattering experiments in their own field Provides a good balance between theory and experimental techniques Provides a complement to Price and Fernandez-Alonso (Eds.), Neutron Scattering - Fundamentals published in November 2013
Author : Wei He (Researcher in materials science)
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Scattering Studies of Magnetic and Charge Correlations in Two-dimensional Quantum Magnets written by Wei He (Researcher in materials science) and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of quantum magnets in two-dimensional systems is a forefront field in both materials science and condensed matter physics research. Such materials not only provide rich platforms for potential applications of novel materials but also further our understanding of basic physics. Neutron and x-ray scattering are powerful tools to explore the magnetic and charge correlations in these materials. This thesis describes the experimental investigation of two model systems in bulk crystalline form, one with a two-dimensional kagome lattice and one with a two-dimensional square lattice, both consisting of Cu2+ ions with spin-1/2. Strong quantum fluctuations give competing ground states or phases in both systems. Recently, barlowite Cu4(OH)6FBr has attracted much attention as the parent compound of a new kagome quantum spin liquid candidate. Our new synthesis method produced large single crystals of a new variant of barlowite, which has a higher symmetry space group compared to the previously reported one. Our elastic magnetic neutron scattering measurements reveal that the magnetic ground state of the new high-symmetry barlowite at low temperatures has a special pinwheel q = 0 magnetic order. In the intermediate temperatures, our numerical calculations and inelastic neutron scattering indicate that the kagome spins are in a potential pinwheel valence bond crystal state. Both of the two ground states are in close proximity to the long-sought quantum spin liquid state. The second part of my thesis is focused on the spin and charge correlations in high-Tc cuprate superconductors. Cuprate materials display intriguing physical phenomena due to the coexistence of various phases, which may interact with the superconductivity. The La-based family is a canonical example where both the spin and charge correlations could form "stripes". Magnetic neutron scattering reveals a rather surprising feature of the spin stripes in the model material La1.88Sr0.12CuO4: regardless of whether they are static or fluctuating, these stripes are always tilted from the high-symmetry direction of underlying lattices. Comparison with numerical simulations reveals the important role of the next-nearest neighbor electron hopping. Resonant soft x-ray scattering measurements offer important information about the charge order in another cuprate material stage-6 O-doped La2CuO4+y. By tuning both temperature and the dopant disorder level, we clearly observe two types of charge orders with distinct correlation lengths and behaviors at low temperatures. A coherent picture based on microscopic phase separation is proposed to explain the relationship between charge and spin orders with superconductivity in these materials.
Author : Michael Banton
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (79 download)
Download or read book Adaptation and Integration in the Social System of Temne Immigrants in Freetown written by Michael Banton and published by . This book was released on 1956 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ulrich Schollwöck
Publisher : Springer
ISBN 13 : 3540400664
Total Pages : 488 pages
Book Rating : 4.5/5 (44 download)
Download or read book Quantum Magnetism written by Ulrich Schollwöck and published by Springer. This book was released on 2008-05-14 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Closing a gap in the literature, this volume is intended both as an introductory text at postgraduate level and as a modern, comprehensive reference for researchers in the field. Provides a full working description of the main fundamental tools in the theorists toolbox which have proven themselves on the field of quantum magnetism in recent years. Concludes by focusing on the most important cuurent materials form an experimental viewpoint, thus linking back to the initial theoretical concepts.
Author : Miska Elliot
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Inelastic Neutron and Resonant Elastic X-ray Scattering Studies of Honeycomb Quantum Magnets written by Miska Elliot and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andreas Sieber
Publisher :
ISBN 13 :
Total Pages : 129 pages
Book Rating : 4.:/5 (853 download)
Download or read book Inelastic Neutron Scattering Studies on Spin Clusters and Single-molecule Magnets written by Andreas Sieber and published by . This book was released on 2005 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Viviane Peçanha Antonio
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (113 download)
Download or read book Neutron Scattering Studies of Pyrochlore Quantum Magnets written by Viviane Peçanha Antonio and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Oliver Pieper
Publisher :
ISBN 13 : 9783832527303
Total Pages : 270 pages
Book Rating : 4.5/5 (273 download)
Download or read book Neutron Scattering Investigations of Zero- and One-dimensional Quantum Magnets written by Oliver Pieper and published by . This book was released on 2010 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with the investigation of two different types of low-dimensional quantum magnets using the technique of neutron scattering.In the first part, the magnetic properties of three Mn_6-based single molecule magnets are explored by means of inelastic neutron scattering. The experimental data reveal that small structural distortions of the molecular geometry produce a significant effect on the energy level diagram and therefore on the magnetic properties of the molecules. It will be shown that the giant spin model completely fails to describe the spin level structure of the ground spin multiplets and that the excited S-multiplets play a key role in determining the effective energy barrier for the magnetization reversal.The second part of this thesis presents an in-depth study of the nuclear and magnetic properties of the quasi-one-dimensional Heisenberg antiferromagnet CaV_2O_4. The magnetism in this system arises from the partially filled t_{2g-levels of the V^{3+-ions, which in addition give an orbital degree of freedom to the system.Single crystal and powder neutron diffraction as well as neutron spectroscopy are used to determine the nuclear and magnetic structure as well as the complex excitation spectrum of CaV_2O_4. The results are analysed theoretically and from this the leading exchange paths are deduced and discussed in terms of orbital ordering.
Author : Robin Michael Daub Chisnell
Publisher :
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.:/5 (94 download)
Download or read book Neutron Scattering and Thermodynamic Studies of Quantum Magnetism on the Kagomé Lattice written by Robin Michael Daub Chisnell and published by . This book was released on 2014 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The geometry of the kagome lattice leads to exciting novel magnetic behavior in both ferromagnetic and antiferromagnetic systems. The collective spin dynamics were investigated in a variety of magnetic materials featuring spin-1/2 and spin-1 moments on kagome lattices using neutron scattering and thermodynamic probes. Both ferromagnetic and antiferromagnetic systems were studied. Cu(1,3-bdc) is an organometallic material, where the Cu2+ ions form a ferromagnetic S = 1/2. kagomé system. Synthesis techniques were developed to produce -mg-sized deuterated single crystals, and ~2,000 crystals were partially coaligned to create a sample for neutron scattering measurements. Elastic neutron scattering measurements show the existence of long range magnetic ordering below T = 1.77 K. Integrated Bragg peak intensities were analyzed to determine the structure of ordered magnetic moments. Inelastic neutron scattering measurements show the magnon dispersion spectrum, which consists of a flat high energy band and two dispersive, lower energy bands. The application of a magnetic field perpendicular to the kagome plane opens gaps between these three bands and distorts the flatness of the highest energy band. The system was modelled as a nearest-neighbor Heisenberg ferromagnet with Dzyaloshinskii-Moriya(DM) interaction. The model dispersion and scattering structure factor were calculated and fit to the data to precisely determine the strengths of the nearest-neighbor coupling and DM interaction. The observed manon band structure is a bosonic analog to the band structure of the topological insulator systems. Antiferromagnetic kagome systems can exhibit novel magnetic ground states such as quantum spin liquids and spin nematics. Thermodynamic measurements were performed on the antiferromagnetic kagome materials MgxCu4-x(OH)6 Cl2 , featuring S = 1/2 moments. These measurements reveal magnetic ordering at low values of x that is suppressed with increasing x. At x = 0.75, this ordering is not fully suppressed, but susceptibility and specific heat measurements reveal behavior similar to that of the quantum spin liquid candidate herbertsmithite. Thermodynamic and neutron scattering measurements were performed on the kagome lattice material BaNi3(OH)2(VO4)2, which features S = 1 moments. These measurements reveal competing interactions, which result in a spin glass ordering transition.
Author : Tapan Chatterji
Publisher : Elsevier
ISBN 13 : 0080457053
Total Pages : 574 pages
Book Rating : 4.0/5 (84 download)
Download or read book Neutron Scattering from Magnetic Materials written by Tapan Chatterji and published by Elsevier. This book was released on 2005-11-29 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron Scattering from Magnetic Materials is a comprehensive account of the present state of the art in the use of the neutron scattering for the study of magnetic materials. The chapters have been written by well-known researchers who are at the forefront of this field and have contributed directly to the development of the techniques described. Neutron scattering probes magnetic phenomena directly. The generalized magnetic susceptibility, which can be expressed as a function of wave vector and energy, contains all the information there is to know about the statics and dynamics of a magnetic system and this quantity is directly related to the neutron scattering cross section. Polarized neutron scattering techniques raise the sophistication of measurements to even greater levels and gives additional information in many cases. The present book is largely devoted to the application of polarized neutron scattering to the study of magnetic materials. It will be of particular interest to graduate students and researchers who plan to investigate magnetic materials using neutron scattering. · Written by a group of scientist who have contributed directly in developing the techniques described.· A complete treatment of the polarized neutron scattering not available in literature.· Gives practical hits to solve magnetic structure and determine exchange interactions in magnetic solids.· Application of neutron scattering to the study of the novel electronic materials.
Author : Randy S Fishman
Publisher : Morgan & Claypool Publishers
ISBN 13 : 1643271148
Total Pages : 225 pages
Book Rating : 4.6/5 (432 download)
Download or read book Spin-Wave Theory and its Applications to Neutron Scattering and THz Spectroscopy written by Randy S Fishman and published by Morgan & Claypool Publishers. This book was released on 2018-11-05 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two of the most powerful tools used to study magnetic materials are inelastic neutron scattering and THz spectroscopy. Because the measured spectra provide a dynamical fingerprint of a magnetic material, those tools enable scientists to unravel the structure of complex magnetic states and to determine the microcscopic interactions that produce them. This book discusses the experimental techniques of inleastic neutron scattering and THz spectroscopy and provides the theoretical tools required to analyze their measurements using spin-wave theory. For most materials, this analysis can resolve the microscopic magnetic interactions such as exchange, anisotropy, and Dzyaloshinskii-Moriya interactions. Assuming a background in elementary statistical mechanics and a familiarity with the quantized harmonic oscillator, this book presents a comprehensive review of spin-wave theory and its applications to both inelastic neutron scattering and THz spectroscopy. Spin-wave theory is used to study several model magnetic systems, including non-collinear magnets such as spirals and cycloids that are produced by geometric frustration, competing exchange interactions, or Dzyaloshinskii-Moriya interactions. Several case studies utilizing spin-wave theory to analyze inelastic neutron-scattering and THz spectroscopy measurements are presented. These include both single crystals and powders and both oxides and molecule-based magnets. In addition to sketching the numerical techniques used to fit dynamical spectra based on microscopic models, this book also contains over 70 exercises that can be performed by beginning graduate students.
Author : Paul Maximo Sarte
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Neutron Inelastic Scattering Studies of Effective Spin-1/2 Magnets written by Paul Maximo Sarte and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xingye Lu
Publisher : Springer
ISBN 13 : 981104998X
Total Pages : 127 pages
Book Rating : 4.8/5 (11 download)
Download or read book Phase Diagram and Magnetic Excitations of BaFe2-xNixAs2: A Neutron Scattering Study written by Xingye Lu and published by Springer. This book was released on 2017-07-10 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book studies the structural, magnetic and electronic properties of, as well as magnetic excitations in, high-temperature BaFe2-xNixAs2 superconductors using neutron diffraction and neutron spectroscopic methods. It describes the precise determination of the phase diagram of BaFe2-xNixAs2, which demonstrates strong magnetoelastic coupling and avoided quantum criticality driven by short-range incommensurate antiferromagnetic order, showing cluster spin glass behavior. It also identifies strong nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2. The nematic correlations have similar temperature and doping dependence as resistivity anisotropy in detwinned samples, which suggests that they are intimately connected. Lastly, it investigates doping evolution of magnetic excitations in overdoped BaFe2-xNixAs2 and discusses the links with superconductivity. This book includes detailed neutron scattering results on BaFe2-xNixAs2 and an introduction to neutron scattering techniques, making it a useful guide for readers pursuing related research.
