Spin Wave Theory And Its Applications To Neutron Scattering And Thz Spectroscopy

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.

Spin Waves and Magnetic Excitations ...

Neutron Scattering

This volume analyzes both the theoretical and experimental aspects of neutron spectroscopy of solids, whereby complex crystals may be analyzed in relation to the theories of symmetry and neutron scattering near a structural or magnetic transition.

This book provides an introduction to the basic principles of neutron scattering and its application to current problems in condensed matter science and technology. Experiments on novel materials are particularly emphasized. Contents:Introduction:Principles of Neutron Scattering (P Böni et al.)Materials Science:Neutron Imaging (E H Lehmann)Neutron Tomography (B Schillinger)Neutron Powder Diffraction and New Materials (A W Hewat)Texture, Strain and Precipitates (M Grosse)Scattering Between Bragg Peaks (B Schönfeld)Optically Active Materials (R A Rupp)Soft Condensed Matter and Biology:Introduction to Soft Matter Systems (M Monkenbusch)SANS of Polymer Networks Under Deformation (W Pyckhout-Hintzen et al.)Dynamics of Polymer Systems (A Arbe)Biomolecular Dynamics by Neutron Scattering (H D Middendorf)Spin Contrast Variation for Macromolecular Research (O Zimmer)Surfaces and Interfaces:Neutron Reflectometry: Technique and Applications (D Clemens)Nanocrystalline Materials: Dominance of Interfaces and Mesoscopic Correlations (W Wagner et al.)Rare-Earth Compounds:Magnetic Ordering Phenomena in Rare-Earth Compounds (L Keller)Crystal-Field Phenomena in Rare-Earth Compounds (A Mirmelstein)Magnetic Excitations:Spin Excitations in Localized and Itinerant Magnets (B Roessli & P Böni)Triplet Excitations in a Family of S=1/2 Unconventional Antiferromagnets (N Cavadini et al.)Superconductivity and Superfluidity:Spin Dynamics in Cuprates and Its Relation to Superconductivity (Ph Bourges)Using Neutrons and Muons to Probe the Vortex Lattice in Type II Superconductors (S L Lee)Magnetic and Electronic Excitations in High-Temperature Superconductors (J Mesot)Superfluid 4Helium — A Very Novel Material (M A Adams)Summary:Summary of the School (W E Fischer) Readership: Materials scientists and condensed matter scientists. Keywords:Neutron Scattering;Neutron Imaging;Soft Matter Systems;Rare-Earth Compounds;Magnetic Excitations;Superconductivity and Superfluidity

This introduction to the theory and experimental techniques associated with neutron scattering has been distilled from a course of lectures presented at a summer school for postgraduate students of chemistry, physics, materials science and biology. Aimed primarily at the experimentalist, the book will be of interest to graduate students and postgraduates beginning research in this exciting field and researchers wishing to learn the new techniques.

This book provides the basic theoretical background for X-ray and neutron scattering experiments. Since these techniques are increasingly being used by biologists and chemists, as well as physicists, the book is intended to be accessible to a broad spectrum of scientists.