Magnetic excitations in quasi-two-dimensional spin-Peierls systems

被引：25

作者：

Brenig, W

机构：

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

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.56.14441

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A study is presented of a two-dimensional frustrated and dimerized quantum spin system which models the effect of interchain coupling in a spin-Peierls compound. Employing a bond-boson method to account for quantum disorder in the ground state the elementary excitations are evaluated in terms of gapful triplet modes. Results for the ground-state energy and the spin gap are discussed. The tripler dispersion is found to be in excellent agreement with inelastic neutron scattering data in the dimerized phase of the spin-Peierls compound CuGeO3. Moreover, consistent with these neutron scattering experiments, the low-temperature dynamic structure factor exhibits a high-energy continuum split off from the elementary triplet mode.

引用

收藏

页码：14441 / 14448

页数：8

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