Raman response in antiferromagnetic two-leg S = 1/2 Heisenberg ladders
Raman response in antiferromagnetic two-leg S = 1/2 Heisenberg ladders
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反铁磁两腿 S = 1/2 海森堡梯子中的拉曼响应
DOI：
10.1209/epl/i2001-00601-y
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发表时间：
2001
期刊：
影响因子：
1.8
通讯作者：
G. Uhrig
中科院分区：
文献类型：
--
作者：
K. Schmidt;C. Knetter;G. Uhrig
通过连续酉变换计算各种耦合的反铁磁 2 腿 S = 1/2 海森堡梯中的拉曼响应。对于高于 80% 梯级耦合的腿耦合，会出现特征 2 峰结构，且连续体内的强度为零。分析了CaV2O5 和La y Ca 14 − y Cu24O41 的实验数据并确定了耦合常数。有证据表明海森堡模型不足以描述铜梯。我们认为循环交换术语是适当的扩展。
The Raman response in the antiferromagnetic 2-leg S = 1/2 Heisenberg ladder is calculated for various couplings by continuous unitary transformations. For leg couplings above 80% of the rung coupling a characteristic 2-peak structure occurs with a point of zero intensity within the continuum. Experimental data for CaV2O5 and La y Ca 14 − y Cu24O41 are analyzed and the coupling constants are determined. Evidence is found that the Heisenberg model is not sufficient to describe cuprate ladders. We argue that a cyclic exchange term is the appropriate extension.