EBookClubs

Read Books & Download eBooks Full Online

EBookClubs

Read Books & Download eBooks Full Online

Book Neutron Scattering Study of Quantum Phase Transitions InIntegral Spin Chains

Download or read book Neutron Scattering Study of Quantum Phase Transitions InIntegral Spin Chains written by and published by . This book was released on 2006 with total page 1007 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quite a few low-dimensional magnets are quantum-disordered 'spin liquids' with a characteristic gap in the magnetic excitation spectrum. Among these are antiferromagnetic chains of integer quantum spins. Their generic feature are long-lived massive (gapped) excitations (magnons) that are subject to Zeeman splitting in external magnetic fields. The gap in one of the magnon branches decreases with field, driving a soft-mode quantum phase transition. The system then enters a qualitatively new high-field phase. The actual properties at high fields, particularly the spin dynamics, critically depend on the system under consideration. Recent neutron scattering studies of organometallic polymer crystals NDMAP (Haldane spin chains with anisotropy) and NTENP (dimerized S = 1 chains) revealed rich and unique physics.

Book Neutron Scattering in Condensed Matter Physics

Download or read book Neutron Scattering in Condensed Matter Physics written by Albert Furrer and published by World Scientific Publishing Company. This book was released on 2009-05-22 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron scattering has become a key technique for investigating the properties of materials on an atomic scale. The uniqueness of this method is based on the fact that the wavelength and energy of thermal neutrons ideally match interatomic distances and excitation energies in condensed matter, and thus neutron scattering is able to directly examine the static and dynamic properties of the material. In addition, neutrons carry a magnetic moment, which makes them a unique probe for detecting magnetic phenomena. In this important book, an introduction to the basic principles and instrumental aspects of neutron scattering is provided, and the most important phenomena and materials properties in condensed matter physics are described and exemplified by typical neutron scattering experiments, with emphasis on explaining how the relevant information can be extracted from the measurements.

Book Neutron Scattering Magnetic and Quantum Phenomena

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

Book Neutron Scattering Studies on Quantum Spin Systems

Download or read book Neutron Scattering Studies on Quantum Spin Systems written by Kazuhisa Kakurai and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Neutron Scattering with a Triple Axis Spectrometer

Download or read book Neutron Scattering with a Triple Axis Spectrometer written by Gen Shirane and published by Cambridge University Press. This book was released on 2002-02-21 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron scattering is an extremely powerful tool in the study of elemental excitations in condensed matter. This book provides a practical guide to basic techniques using a triple-axis spectrometer. Introductory chapters summarize useful scattering formulas and describe the components of a spectrometer, followed by a comprehensive discussion of the resolution function and focusing effects. Later sections include simple examples of phonon and magnon measurements, and an analysis of spurious effects in both inelastic and elastic measurements, and how to avoid them. Finally, polarization analysis techniques and their applications are covered. This guide will allow graduate students and experienced researchers new to neutron scattering to make the most efficient use of their experimental time.

Book Neutron Scattering Studies of Low dimensional Quantum Spin Systems

Download or read book Neutron Scattering Studies of Low dimensional Quantum Spin Systems written by S. P. Gosuly and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Neutron Scattering Studies of Low dimensional Quantum Spin Systems

Download or read book Neutron Scattering Studies of Low dimensional Quantum Spin Systems written by Stefan Paul Gosuly and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Neutron Scattering Studies of Low dimensional Quantum Spin Systems

Download or read book Neutron Scattering Studies of Low dimensional Quantum Spin Systems written by Nikolay Tsyrulin and published by . This book was released on 2010 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Neutron Scattering Study Of Ni V And Ce Ni Cu Sn Close To The Onset Of Magnetic Order

Download or read book Neutron Scattering Study Of Ni V And Ce Ni Cu Sn Close To The Onset Of Magnetic Order written by Shiva Bhattarai and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strongly correlated electron systems are at the borderline of competing phases and can be tuned through different ground states by slight modifications. Therefore, they are good examples to study a quantum phase transition (QPT), to reveal how a quantum critical point (QCP) at zero temperature is responsible for the unconventional properties observed at finite temperatures. QPTs are zero-temperature phase transitions, they are more complex and less understood than common phase transitions at finite temperatures. Examples are lacking, especially in the case where disorder is involved. Recent theories predict the possibility of an exotic quantum critical point in itinerant magnets with induced disorder that is accompanied by a quantum Griffiths phase. To explore such unconventional properties in close neighborhood to a magnetic phase, we aim to reveal the relevant quantum critical fluctuations with neutron scattering. We select systems with different magnetic order and choose as tuning parameter chemical substitution to study the effect of disorder. Such experimental study aims to find key elements of a QCP with disorder. The two systems are the ferromagnetic (FM) alloy, Ni-V, tuned by the V-concentration into a paramagnetic phase, and the non-magnetic Kondo semimetal, Ce(Cu,Ni)Sn, tuned by Cu concentration into an antiferromagnetic state. We apply different neutron scattering techniques and simple models to get essential characteristics of the magnetic correlations and fluctuations close to the QCP. Ni-V is a simple FM-alloy with a random atomic distribution that undergoes a quantum phase transition from a ferromagnetic to a paramagnetic state with sufficient substitution of Ni by V. First indication of a quantum Griffiths phase came from magnetization and [mu]SR data, but the scale of the magnetic clusters remained elusive. Optimized small angle neutron scattering (SANS) data on different polycrystalline Ni-V samples close to the QCP finally show a small magnetic scattering response within the FM state. Using full polarization analysis, we discover short-range correlations of order of several nanometers. In addition, the polarized SANS data show evidence of long-range order. The coexistence of magnetic clusters and long-range ordered domains explain the unusual properties of this disordered FM with a QCP. These results agree with the expectations of a disordered QCP with a quantum Griffith phase. The non-magnetic anisotropic Kondo insulator, CeNiSn, presents a rather unique magnetic excitation spectrum with gaps. Cu doping leads to an antiferromagnetic ordered state with a small magnetic moment. We collected the first inelastic neutron scattering data of a single crystalline sample with Cu concentration at the onset of the magnetic order and revealed the magnetic excitation spectrum at a specific wave vector. It does not show a gap anymore, but magnetic order. In addition, we identify a fluctuation spectrum, including one-dimensional critical magnetic fluctuations. These first data already shed some light on the complex behavior of this Kondo semimetal driven by anisotropic hybridization and disorder. Overall these neutron scattering data reveal relevant quantum fluctuations close to onset of magnetic order that help to characterize the nature of the transition

Book Neutron Scattering Studies on Phase Transitions in CD 3 ND 3 2 CuCl 4 and MnCl 2 4H 2 O

Download or read book Neutron Scattering Studies on Phase Transitions in CD 3 ND 3 2 CuCl 4 and MnCl 2 4H 2 O written by Josephus Johannes Maria Steyger and published by . This book was released on 1982 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Introduction to Frustrated Magnetism

Download or read book Introduction to Frustrated Magnetism written by Claudine Lacroix and published by Springer Science & Business Media. This book was released on 2011-01-12 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Phase Transitions and Neutron Scattering

Download or read book Phase Transitions and Neutron Scattering written by and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review is given of recent advances in neutron scattering studies of solid state physics. The author has selected the study of a structural phase transition as the best example to demonstrate the power of neutron scattering techniques. Since energy analysis is relatively easy, the dynamical aspects of a transition can be elucidated by the neutron probe. He will discuss in some detail current experiments on the 100K transition in SrTiO3, the crystal which has been the paradigm of neutron studies of phase transitions for many years. This new experiment attempts to clarify the relation between the neutron central peak, observed in energy scans, and the two length scales observed in recent x-ray diffraction studies where only scans in momentum space are possible.