EXPERIMENTAL-EVIDENCE OF A DIMENSIONAL CROSSOVER IN Y1BA2CU3O7-SIGMA
EXPERIMENTAL-EVIDENCE OF A DIMENSIONAL CROSSOVER IN Y1BA2CU3O7-SIGMA
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DOI：
10.1103/physrevlett.64.1573
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发表时间：
1990-03-26
影响因子：
8.6
通讯作者：
LIU, JZ
中科院分区：
文献类型：
--
作者：
FARRELL, DE;RICE, JP;LIU, JZ
在63< T< 88 K（Tc = 90.5 K）的温度范围内，获得了Y1 Ba 2 Cu 3 O 7− δ非孪晶单晶的高分辨率扭矩-磁力测量数据。在T= 80 K及以上，数据非常符合公认的三维唯象理论，但低于此温度时，磁场靠近Cu-O平面时，会产生异常扭矩。我们的研究结果的定性和定量的功能提供了强有力的证据表明，故障的三维描述低于80 K与交叉到二维超导行为。
High-resolution torque-magnetometry data have been obtained on an untwinned single crystal of Y 1 Ba 2 Cu 3 O 7− δ in the temperature range 63< T< 88 K (T c= 90.5 K). At T= 80 K and above, the data are fitted extremely well with the accepted three-dimensional phenomenological theory, but below this temperature an anomalous torque develops when the magnetic field lies close to the Cu-O planes. The qualitative and quantitative features of our results provide strong evidence that breakdown of the three-dimensional description below 80 K is associated with a crossover to two-dimensional superconducting behavior.