Lattice dimerization ia the spin-Peierls compound CuGeO3

被引：13

作者：

Büchner, B

Fehske, H

Kampf, AP

Wellein, G

机构：

[1] Univ Bayreuth, Inst Phys, D-95440 Bayreuth, Germany

[2] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[3] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany

来源：

PHYSICA B-CONDENSED MATTER | 1999年 / 259-61卷

关键词：

spin-Peierls transition; dynamical spin-phonon coupling; exact diagonalization;

D O I：

10.1016/S0921-4526(98)00720-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The uniaxial pressure dependence of the exchange coupling and the structural distortion in the dimerized phase of CuGeO3 are analyzed. A minimum magnetic dimerization of 3% is obtained incompatible with an adiabatic approach to the spin-Peierls transition. Exploring the properties of an Heisenberg spin chain with dynamical spin-phonon coupling, the dimerization dependence of the spin excitation gap is found to be in qualitative agreement with experiment. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：956 / 957

页数：2

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