Study Of One And Two Dimensional Magnetic Systems With Spin Singlet Ground State
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Quantum Magnetism
Author | : Ulrich Schollwöck |
Publisher | : Springer |
Total Pages | : 488 |
Release | : 2008-05-14 |
Genre | : Science |
ISBN | : 3540400664 |
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.
Valence Bond Theory
Author | : David Cooper |
Publisher | : Elsevier |
Total Pages | : 837 |
Release | : 2002-06-05 |
Genre | : Science |
ISBN | : 0080543499 |
Valence bond (VB) theory, which builds the descriptions of molecules from those of its constituent parts, provided the first successful quantum mechanical treatments of chemical bonding. Its language and concepts permeate much of chemistry, at all levels. Various modern formulations of VB theory represent serious tools for quantum chemical studies of molecular electronic structure and reactivity. In physics, there is much VB-based work (particularly in semi-empirical form) on larger systems. Importance of TopicThe last decade has seen significant advances in methodology and a vast increase in the range of applications, with many new researchers entering the field.Why This TitleValence Bond Theory succeeds in presenting a comprehensive selection of contributions from leading valence bond (VB) theory researchers throughout the world. It focuses on the vast increase in the range of applications of methodology based on VB theory during the last decade and especially emphasizes recent advances.
Concise Encyclopedia of Magnetic and Superconducting Materials
Author | : K.H.J. Buschow |
Publisher | : Elsevier |
Total Pages | : 1361 |
Release | : 2005-12-28 |
Genre | : Technology & Engineering |
ISBN | : 0080457657 |
Magnetic and superconducting materials pervade every avenue of the technological world – from microelectronics and mass-data storage to medicine and heavy engineering. Both areas have experienced a recent revitalisation of interest due to the discovery of new materials, and the re-evaluation of a wide range of basic mechanisms and phenomena. This Concise Encyclopedia draws its material from the award-winning Encyclopedia of Materials and Engineering, and includes updates and revisions not available in the original set -- making it the ideal reference companion for materials scientists and engineers with an interest in magnetic and superconducting materials. Contains in excess of 130 articles, taken from the award-winning Encyclopedia of Materials: Science and Technology, including ScienceDirect updates not available in the original set Each article discusses one aspect of magnetic and superconducting materials and includes photographs, line drawings and tables to aid the understanding of the topic at hand Cross-referencing guides readers to articles covering subjects of related interest
Electron Paramagnetic Resonance
Author | : Bruce C Gilbert |
Publisher | : Royal Society of Chemistry |
Total Pages | : 413 |
Release | : 2007-10-31 |
Genre | : Science |
ISBN | : 1847553567 |
Electron Paramagnetic Resonance (EPR) Volume 19 highlights major developments in this area reported up to the end of 2002, with results being set into the context of earlier work and presented as a set of critical yet coherent overviews. The topics covered describe contrasting types of application, ranging from biological areas such as EPR studies of free-radical reactions in biology and medically-related systems, to experimental developments and applications involving EPR imaging, the use of very high fields, and time-resolved methods. Critical and up-to-the-minute reviews of advances involving the design of spin-traps, advances in spin-labelling, paramagnetic centres on solid surfaces, exchange-coupled oligomers, metalloproteins and radicals in flavoenzymes are also included. As EPR continues to find new applications in virtually all areas of modern science, including physics, chemistry, biology and materials science, this series caters not only for experts in the field, but also those wishing to gain a general overview of EPR applications in a given area. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading authorities in the relevant subject areas, the series creates a unique service for the active research chemist, with regular, in-depth accounts of progress in particular fields of chemistry. Subject coverage within different volumes of a given title is similar and publication is on an annual or biennial basis.
Introduction to Frustrated Magnetism
Author | : Claudine Lacroix |
Publisher | : Springer Science & Business Media |
Total Pages | : 682 |
Release | : 2011-01-12 |
Genre | : Science |
ISBN | : 3642105890 |
The field of highly frustrated magnetism has developed considerably and expanded over the last 15 years. Issuing from canonical geometric frustration of interactions, it now extends over other aspects with many degrees of freedom such as magneto-elastic couplings, orbital degrees of freedom, dilution effects, and electron doping. Its is thus shown here that the concept of frustration impacts on many other fields in physics than magnetism. This book represents a state-of-the-art review aimed at a broad audience with tutorial chapters and more topical ones, encompassing solid-state chemistry, experimental and theoretical physics.
Dmrg Study of the Spin Liquid Ground State of the Kagome Heisenberg Antiferromagnet
Author | : Simeng Yan |
Publisher | : |
Total Pages | : 103 |
Release | : 2011 |
Genre | : |
ISBN | : 9781267108012 |
Condensed matter physicists have long sought a realistic two dimensional (2D) magnetic system whose ground state is a spin liquid - a zero temperature state in which quantum fluctuations have melted away any form of magnetic order. The nearest-neighbor S = 1/2 Heisenberg model on the kagome lattice has seemed an ideal candidate, but in recent years some approximate numerical approaches to it have yielded instead a valence bond crystal. We have used the density matrix renormalization group (DMRG) to perform very accurate simulations on numerous cylinders with circumferences up to 12 lattice spacings, total sizes up to 400-500 sites, finding instead of the valence bond crystal a singlet-gapped spin liquid with substantially lower energy that appears to have Z2 topological order. In my thesis, we will focus on the techniques to apply DMRG efficiently to study 2D frustrated quantum systems, and our results, through a combination of very low energy, short correlation lengths and corresponding small finite size effects, and consistent behavior on many cylinders, provide strong evidence that the 2D ground state of this model is a gapped spin liquid. The spin liquid can be viewed as a melted valence bond crystal formed from 8 site diamond loops and dimers with a 12 site unit cell, called the diamond pattern. We will show that the diamond pattern appears naturally when enhancing the bonds on the resonant loops. Also we will study one of the narrowest cylinders, with a circumference of 4 lattice spacings which accommodates the diamond pattern, but for which the spin liquid ground state, while metastable state in DMRG, is higher in energy than another state with ``a topological string". The peculiar behavior of this narrow cylinder is presumably due to short resonance loops around the cylinder.