Unusual paramagnetic phenomena in granular high-temperature superconductors-A consequence of d- wave pairing?
Unusual paramagnetic phenomena in granular high-temperature superconductors-A consequence of d- wave pairing?
复制标题
粒状高温超导体中不寻常的顺磁现象——d波配对的结果？
DOI：
10.1103/revmodphys.67.503
复制
发表时间：
1995
影响因子：
44.1
通讯作者：
T. M. Rice
中科院分区：
文献类型：
--
作者：
M. Sigrist;T. M. Rice
本次研讨会回顾了粒状高温超导体中的一些不寻常的顺磁现象。通过假设相邻颗粒之间的耦合模式存在挫败，可以一致地解释这些问题。如果有序参数由于较高角动量通道中的库珀配对（例如 {ital d} 波配对）而具有非常规对称性，那么在具有约瑟夫森结的多重连接超导体中，这种挫败效应会以自然的方式发生。引入了一个简单的模型来描述受挫粒状超导体的磁特性。大轨道磁矩自发产生，导致超顺磁行为。这些结果表明，不寻常的顺磁现象是高温超导体中配对状态非常规对称性的结果。
This colloquium reviews some unusual paramagnetic phenomena in granular high-temperature superconductors. These are consistently explained by assuming that there is frustration in the coupling patterns between the neighboring grains. Such frustration effects occur in a natural way in a multiply connected superconductor with Josephson junctions if the order parameter has unconventional symmetry due to Cooper pairing in a higher angular momentum channel, e.g., {ital d}-wave pairing. A simple model is introduced to describe the magnetic properties of a frustrated granular superconductor. Large orbital magnetic moments are spontaneously created, leading to superparamagnetic behavior. These results suggest that the unusual paramagnetic phenomena are a consequence of unconventional symmetry of the pairing state in the high-temperature superconductors.