Anomalous thermal conductivity of frustrated heisenberg spin chains and ladders.
Anomalous thermal conductivity of frustrated heisenberg spin chains and ladders.
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受挫海森堡自旋链和梯子的异常热导率。
DOI：
10.1103/physrevlett.89.156603
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发表时间：
2002
影响因子：
8.6
通讯作者：
C. Gros
中科院分区：
文献类型：
--
作者：
J. Álvarez;C. Gros
研究了几种量子自旋链和量子自旋梯的热输运性质。我们发现在有限的温度下检查的模型的发散热导率的迹象。非发散前因子kappa（（th））（T）达到峰值时的温度一般大大低于相应比热c（V）（T）达到最大值时的温度。我们表明，这种结果的微观方法导致大幅减少的磁平均自由程λ的估计提取通过分析最近的实验，相比类似的分析唯象理论。
We study the thermal transport properties of several quantum-spin chains and ladders. We find indications for a diverging thermal conductivity at finite temperatures for the models examined. The temperature at which the nondiverging prefactor kappa((th))(T) peaks is, in general, substantially lower than the temperature at which the corresponding specific heat c(V)(T) is maximal. We show that this result of the microscopic approach leads to a substantial reduction for estimates of the magnetic mean-free path lambda extracted by analyzing recent experiments, as compared to similar analyses by phenomenological theories.