Magnetic field and temperature phase diagram of the pressurized organic superconductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br in the field parallel to the conducting plane
Magnetic field and temperature phase diagram of the pressurized organic superconductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br in the field parallel to the conducting plane
复制标题
加压有机超导体kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br在平行于导电面的场中的磁场和温度相图
DOI：
10.1103/physrevb.65.134510
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发表时间：
2002
影响因子：
3.7
通讯作者：
G. Saito
中科院分区：
文献类型：
--
作者：
S. Kamiya;Y. Shimojo;M. Tanatar;T. Ishiguro;H. Yamochi;G. Saito
研究了层状有机超导体κ-(BEDT-TTF) 2 Cu[N(CN) 2]Br的上临界场h2，重点研究了平行于导电平面的场方向。静水压力的应用改变了h2 (T)图的形状，消除了在高温地区环境压力下观察到的显著曲率，并且几乎呈线性相关。这种变化归因于压力下的轨道对断裂效应占主导地位，而不是环境压力下的h2的泡利顺磁极限。在温度范围内，h2 (T)曲线的斜率在压力作用下发生突变，这是由于BEDT-TTF分子中乙烯片段的排列顺序引起的材料的相变。
The upper critical field H c 2 of the layered organic superconductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br has been studied with emphasis on the field direction parallel to the conducting plane. Application of hydrostatic pressure changes the shape of the H c 2 (T) diagram, removing a notable curvature observed at ambient pressure in the high-temperature region and giving almost linear dependence. The change is ascribed to the dominance of the orbital pair-breaking effect under pressure as opposed to the Pauli paramagnetic limiting of H c 2 at ambient pressure. An abrupt change by pressure of the slope of the H c 2 (T) curve in a temperature range near T c is ascribed to the phase change in the material due to the ordering of the ethylene fragments of the BEDT-TTF molecules.