Fizika Nizkikh Temperatur: Volume 43, Number 11 (November 2017), p. 1676-1683    ( to contents , go back )

Phenomenological description of a spin chain system with geometrical frustration of couplings

A.A. Zvyagin

Max-Planck-Institut für Physik komplexer Systeme, 38 Nöthnitzer Str., Dresden 01187, Germany

B. Verkin Institute for Low Temperature Physics and Engeneering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
E-mail: zvyagin@ilt.kharkov.ua

Received April 18, 2017

Abstract

The phenomenological model, using which we can in a relatively simple way calculate many magnetic, thermo-dynamic and dynamic characteristics of the spin chain material with the geometrical frustration of spin-spin couplings is proposed. The results of theoretical calculations well reproduce observed details of the low-temperature behavior of the magnetization, magnetic susceptibility, specific heat, magneto-acoustic characteristics, and some dynamical properties. In particular, the model permits to explain the double peak structure of the temperature dependencies of the magnetic susceptibility, specific heat, and the renormalization of the sound velocity, and can explain several features of the ESR frequency-field diagram.

PACS: 75.10.Jm Quantized spin models, including quantum spin frustration;
PACS: 75.10.Pq Spin chain models;
PACS: 75.40.Cx Static properties;
PACS: 75.40.Jb Dynamic properties.

Key words: spin chain system, magnetic susceptibility, specific heat, sound velocity.

Published online: September 25, 2017

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