Book/Report

FZJ-2018-03057

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mikroskopische Theorie der Elektron Spin Resonanz in Heisenberg Spingläsern und thermische Fluktuationen in klassischen Spinmodellen mit Zufallsfeldern

Schulz, U. (Corresponding author)FZJ*

1988
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18594

Report No.: Juel-2227

Abstract: This work consists of two parts : one that contains a microscopic theory of electron spin resonance (ESR) in Heisenberg spinglasses, the other one discusses thermal fluctuations in some classical spin models with random fields. After a brief review of theoretical work concerning the ESR frequencies and its linewidths, part one gives a microscopic picture of the phenomenological theory of ESR frequencies of Henley /Sompolinsky/Halperin. A mode coupling approach to the damping of these frequenciesis is developed. The last section of this part contains numerical results of the mode coupling theory. Part two describes a class of classical spin models with random fields and derives a hierarchy of exact identities for the static correlation functions. This is done in real and replica space. It is rigorously shown that for low temperatures and strong randomness the argument of Iinry/Ma yields the right scaling behaviour of the pair correlation in the 1-d random field Ising model (RFIM). The result is used to discuss the scaling behaviour of domain wall fluctuations in the higher dimensional RFIM.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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