DYNAMICS OF A SYSTEM WITH 3-SPIN INTERACTION IN THE APPROXIMATION OF A GAUSSIAN FLUCTUATING LOCAL-FIELD | Научно-инновационный портал СФУ

DYNAMICS OF A SYSTEM WITH 3-SPIN INTERACTION IN THE APPROXIMATION OF A GAUSSIAN FLUCTUATING LOCAL-FIELD

Тип публикации: статья из журнала

Год издания: 1995

Идентификатор DOI: 10.1007/BF01040403

Аннотация: For a system of spins with effective Hamiltonian induced by a strong rf field, a study is made of the effect of fluctuations of the precession frequency on the form of the spin time correlation functions (TCF). In Anderson's approximation, the two-spin interaction makes a contribution to this frequency corresponding to a Gaussian fluctuating local field, whereas the three-spin interaction makes two contributions: one involving the square of this field and another that can be expressed in terms of a new Gaussian random variable. Expressions are obtained that make it possible to calculate the TCF for a Gaussian random process with arbitrary correlation function. Various limiting cases are discussed. The calculations are made for noise with correlation functions of exponential and Gaussian forms. It is shown that the properties of the TCF of a system with three-spin interaction differ from the known properties for systems with two-spin interaction.

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Издание

Журнал: THEORETICAL AND MATHEMATICAL PHYSICS

Выпуск журнала: Vol. 102, Is. 2

Номера страниц: 224-234

ISSN журнала: 00405779

Место издания: NEW YORK

Издатель: PLENUM PUBL CORP

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