Low Energy Excitations in Spin Clusters and Molecular Solids PDF Download
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Languages : en
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This thesis investigates low energy magnetic and vibrational excitations in molecular solids. Analytical and numerical studies of these two types of excitations, both in idealized systems and in more complicated models that are thought to capture the relevant physics of several materials. The materials considered include molecular magnets and layered organic superconductors and semiconductors. Our results include exact expressions for certain magnetic observables, neutron scattering structure factors for small spin 1/2 clusters, studies of the molecular dynamics of FeBr molecular magnet, the effects of symmetry breaking in (DT-TTF)2Au(mnt)2 spin ladder candidate, and the importance of totally symmetric modes in [kappa]-ET-based superconductors with reduced symmetries. Finally, a preliminary study of the interaction of magnetic and vibrational excitations in a model coupled Hamiltonian is discussed, which illustrates spin-vibrational effects that may be observable in future studies of magnetic materials.
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Languages : en
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Book Description
This thesis investigates low energy magnetic and vibrational excitations in molecular solids. Analytical and numerical studies of these two types of excitations, both in idealized systems and in more complicated models that are thought to capture the relevant physics of several materials. The materials considered include molecular magnets and layered organic superconductors and semiconductors. Our results include exact expressions for certain magnetic observables, neutron scattering structure factors for small spin 1/2 clusters, studies of the molecular dynamics of FeBr molecular magnet, the effects of symmetry breaking in (DT-TTF)2Au(mnt)2 spin ladder candidate, and the importance of totally symmetric modes in [kappa]-ET-based superconductors with reduced symmetries. Finally, a preliminary study of the interaction of magnetic and vibrational excitations in a model coupled Hamiltonian is discussed, which illustrates spin-vibrational effects that may be observable in future studies of magnetic materials.
Author: Samed Halilov
Publisher: Springer Science & Business Media
ISBN: 1402027087
Category : Science
Languages : en
Pages : 260
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Book Description
Most recent publications on spin-related phenomena focus on technological aspects of spin-dependent transport, with emphasis on the specific needs of spintronics. The present publication targets rather fundamental problems related to the physics of spin in solids, such as: (1) manifestation of spin and orbital polarization in spectroscopy, including valence and X-ray photoemission, magneto-optics, low-energy electron scattering on the surface; (2) application of new methods for interpretation and determination of magnetic low-lying excitations in the bulk and on the surface; (3) recent progress in evaluation of different type of magnetic forces including spin-orbit and exchange interaction, with subsequent determination of anisotropy and spin-ordering structure; (4) general problems of spin-dependent transport in semiconductors and metals, such as current-caused torque effect on spins at interfaces and spin injection in quantum dot systems; (5) problems in understanding the spin-dependent trends in unconventional superconductors; (6) many-body problems in solid state physics and recent progress in evaluation of self-energy effects; (7) fabrication of new magnetic materials with pre-programmed properties based on assembly from nano-particles, etc.
Author: J. T. Devreese
Publisher: Springer Science & Business Media
ISBN: 1468428233
Category : Science
Languages : en
Pages : 386
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Book Description
The Advanced Study Institute on 'Elementary Excitations in Solids, Molecules, and Atoms' was held at the University of Antwerp (U.I.A.) from June 18th till June 30th 1973. The In stitute was sponsored by NATO. Co-sponsors were: Agfa-Gevaert N.V. (Mortsel-Belgium), Bell Telephone Mfg. Co. (Antwerp-Belgium), I.B.M. BelgiumN. V. (Brussels-Belgium), the National Science Founda tion (Washington D.C. - U.S .A.) and the Uni versi ty of Antwerp (U.I .A.) . A total of 120 lecturers and participants attended the Institute. Over the last few years, substantial progress has been made in the description of the elementary excitations of the elec tronic and vibrational systems and their interactions. Parallel with this, the experimentalists have obtained outstanding re sults, partly as a result of availability of coherent light sour ces from the far infrared through the visible region, and partly because of the availability of synchrotron radiation sources in the soft X-ray region. The results of today will lead to fur ther progress over the next years. It was the purpose of this NATO Advanced Study Institute to present a state of the art, namely a survey of experiment and theory.
Author: Jozef T. Devreese
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 400
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Book Description
The Advanced Study Institute on 'Elementary Excitations in Solids, Molecules, and Atoms' was held at the University of Antwerp (U.I.A.) from June 18th till June 30th 1973. The In stitute was sponsored by NATO. Co-sponsors were: Agfa-Gevaert N.V. (Mortsel - Belgium), Bell Telephone Mfg. Co. (Antwerp Belgium), the National Science Foundation (Washington D.C. - U.S.A.) and the University of Antwerp (U.I.A.). A total of 120 lecturers and participants attended the Institute. Over the last few years, substantial progress has been made in the description of the elementary excitations of the elec tronic and vibrational systems and their interactions. Parallel with this, the experimentalists have obtained outstanding re sults, partly as a result of availability of coherent light sour ces from the far infrared through the visible region, and partly because of the availability of synchrotron radiation sources in the soft X-ray region. The results of today will lead to fur ther progress over the next years. It was the purpose of this NATO Advanced Study Institute to present astate of the art, namely a survey of experiment and theory.
Author: J. T. Devreese
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 408
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Author: H. Hooper
Publisher: Springer Science & Business Media
ISBN: 1461345685
Category : Science
Languages : en
Pages : 437
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Book Description
The title of amorphous magnetism was conceived to en compass the study of the magnetic properties of dilute ran dom substitutional alloys, amorphous metallic alloys, amor phous magnetic semiconductors and the conventional glasses, including cha1cogenide, organic and inorganic glasses. These materials have heretofore been considered to be quite different because of the differences in their atomic struc tures. However, when the magnetic behavior of these mater ials is carefully examined it becomes clear that these materials exhibit certain similarities. For the first time at the International Symposium on Amorphous Magnetism held at Wayne State University in Detroit, Michigan on August 17 and 18, 1972, scientists working in these areas were assembled to examine the similarities of these systems. This volume contains a summary of the 9 invited talks, 23 delivered, contributed papers and an additional 12 contri buted papers whcih were not presented because of insuffic ient time in the program. This volume presents for the first time a collection of the most current theoretical and experimental studies in the area of amorphous magnetism. We wish to thank the authors of these papers for their outstanding cooperation in preparing their manuscripts and for editing our transcriptions from tape recordings of the discussions which followed their presentations. In addition, we wish to thank the participants at this conference whose enthusiasm and interest made the conference so successful.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 568
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Author: J. M. Carpenter
Publisher: Cambridge University Press
ISBN: 0521857813
Category : Science
Languages : en
Pages : 539
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Book Description
This book provides a comprehensive and up-to-date introduction to the fundamental theory and applications of slow-neutron scattering.
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 536
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Author: Bunshi Kagaku Kenkyūjo
Publisher:
ISBN:
Category : Chemical bonds
Languages : en
Pages : 338
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