首页> 外文期刊>Applied Magnetic Resonance >ESR Probing of Quantum Critical Phenomena in Doped S = 1/2 AF Quantum Spin Chain
【24h】

ESR Probing of Quantum Critical Phenomena in Doped S = 1/2 AF Quantum Spin Chain

机译:掺杂S = 1/2 AF量子自旋链中量子临界现象的ESR探测。

获取原文
获取原文并翻译 | 示例
           

摘要

The results of high-frequency (60-315 GHz) election spin resonance (ESR) studies of CuGeO3 single crystals containing 0 9% Mn impurity are reported The quantitative ESR line shape analysis shows that the low-temperature (T < 40 K) magnetic susceptibility of Cu2+ chains diverges as %~ IT" with the critical exponent a= 0 81 ±0 03 and therefore indicates the onset of a quantum critical (QC) regime A scenario in which the disorder caused by the Mn impurity in quantum spin chains of CuGeO3 may lead to the coexistence of the quantum critical regime and the spin-Peierls dimerization is discussed. For the quantitative description of the temperature dependences of the line width and g-factor, a model assuming a crossover from the high-temperature semiclassical Nagata and Tazuke limit to the low-temperature quantum case described by Oshikawa and Affleck's theory is suggested.
机译:报道了含0 9 9%Mn杂质的CuGeO3单晶的高频(60-315 GHz)选举自旋共振(ESR)研究结果定量ESR线形分析表明低温(T <40 K)磁性Cu 2+链的磁化率随%〜 IT“的变化而变化,临界指数为a = 0 81±0 03,因此表明出现了量子临界(QC)态。一种情况是由量子自旋链中的Mn杂质引起的的CuGeO3可能导致量子临界状态的共存,并讨论了自旋-Peierls二聚化。为了定量描述线宽和g因子的温度依赖性,该模型假设了一个与高温半经典永田有交叉的模型提出了Oshikawa和Affleck的理论所描述的低温量子情况的Tazuke极限。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号