Raman scattering from frustrated quantum spin chains

被引：16

作者：

Brenig, W

机构：

[1] Institut für Theoretische Physik, Universität zu Köln, D-50937 Köln

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.56.2551

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic Raman scattering from a frustrated spin-1/2 Heisenberg chain is considered with a focus on the uniform phase of the spin-Peierls compound CuGeO3. The Raman intensity is analyzed in terms of a Loudon-Fleury scattering process using a spinless-fermion mean-field theory developed for the frustrated spin chain. A comparison to experimental data is presented and the frustration and temperature dependence is studied. In good agreement with observed spectra a broad inelastic four-spinon continuum is found at low temperatures above the spin-Peierls transition. At high temperatures the intensity develops a quasielastic line analogous to experiment.

引用

页码：2551 / 2555

页数：5

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