Low Temperature Physics: 31, 203 (2005); https://doi.org/10.1063/1.1884423 (21 pages)
Fizika Nizkikh Temperatur: Volume 31, Number 3-4 (March 2005), p. 272-299    ( to contents , go back )

Spin gap in low-dimensional magnets (Review Article)

A.N. Vasil`ev, M.M. Markina, and E.A. Popova

The Moscow State University М.В. Lomonosov , Moscow, 119992, Russia
E-mail: anvas2000@yahoo.com
pos Анотація:

Received October 18, 2004

Abstract

The basic mechanisms of spin gap formation in low-dimensional metaloxide compounds are reviewed. Among the objects which show the singlet ground state are dimers, half-integer spin chains, integer spin uniform chains, spin ladders and two-dimensional arrays of exchange coupled spins. In some of these systems the spin gap in magnetic excitation spectrum is inherent, while in others it is formed due to magnetoelastic interaction, charge or orbital ordering.

PACS:
75.30.-m - Intrinsic properties of magnetically ordered materials (for critical point effects, see 75.40.-s)
75.45.+j - Macroscopic quantum phenomena in magnetic systems
75.50.-y - Studies of specific magnetic materials

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