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arXiv 0708.4162cond-mat.str-el
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1/3磁化强度磁弹性$J_1-J_2$反铁磁链中的类Spin-Peierls相

Spin-Peierls-like phases in magnetoelastic $J_1-J_2$ antiferromagnetic chain at 1/3 magnetization

H. D. Rosales, G. L. Rossini

摘要:

研究了自旋$S=1/2$反铁磁$J_1-J_2$海森堡链在$M=1/3$磁化强度下与声子耦合时的弹性形变.使用玻色化方法,我们预测存在非均匀的三聚磁弹性相。一个丰富的基态相图中发现,包括经典和量子平台状态的磁部门,以及不等价的晶格变形内的每个磁相。小团簇的精确对角化支持了分析结果。

英文摘要:

We investigate elastic deformations of spin $S=1/2$ antiferromagnetic $J_1-J_2$ Heisenberg chains, at $M=1/3$ magnetization, coupled to phonons in the adiabatic approximation. Using a bosonization approach we predict the existence of non-homogeneous trimerized magnetoelastic phases. A rich ground state phase diagram is found, including classical and quantum plateau states for the magnetic sector as well as inequivalent lattice deformations within each magnetic phase. The analytical results are supported by exact diagonalization of small clusters.

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