Spin locking and freezing phenomena in the antiferromagnetic Heisenberg model on the three-leg ladder

被引：10

作者：

Azzouz, M ^{[1
]}

Asante, KA ^{[1
]}

机构：

[1] Laurentian Univ, Dept Phys & Astron, Sudbury, ON P3E 2C6, Canada

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.72.094433

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The antiferromagnetic Heisenberg model on the three-leg ladder is studied using the generalized Jordan-Wigner transformation in dimensions higher than 1, and the bond-mean-field theory. The magnetic susceptibility and other thermodynamic quantities are analyzed as a function of the rung-to-leg coupling ratio alpha and temperature T. We fit the experimental susceptibility data of the three-leg material Sr2Cu3O5 of Azuma and co-workers with good agreement. One of the main findings of this work is the proposal that close to two-thirds of the spin degrees of freedom on each of the rungs of the ladder lock at low T for small alpha, then collectively almost 2/3 of the spin degrees of freedom on all the rungs freeze completely at low T for alpha greater than a threshold value. The approach developed here can be used to study the three-leg ladder for all values of alpha, and is thus suitable for the description of the crossover regime between the weak- and strong-coupling regimes.

引用

页数：10

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