MEASUREMENT OF THE AB PLANE ANISOTROPY OF MICROWAVE SURFACE IMPEDANCE OF UNTWINNED YBA2CU3O6.95 SINGLE-CRYSTALS
MEASUREMENT OF THE AB PLANE ANISOTROPY OF MICROWAVE SURFACE IMPEDANCE OF UNTWINNED YBA2CU3O6.95 SINGLE-CRYSTALS
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DOI：
10.1103/physrevlett.73.2484
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发表时间：
1994-10-31
影响因子：
8.6
通讯作者：
TIMUSK, T
中科院分区：
文献类型：
--
作者：
ZHANG, K;BONN, DA;TIMUSK, T
在Yba(2)Cu(3)O（6.95）中测量了表面电阻R(s)和穿透深度λ在a和b两个方向上的温度依赖性。整体的温度依赖性是相似的，并且在低温度下表现出线性行为，这反对链在表面阻抗的非常规行为中起直接作用。这些无双晶的剩余R(s)非常小，这意味着剩余电导率是Lee [Phys]预测的最小值的数量级。[j] d波超导体。
The temperature dependence of the surface resistance R(s) and the penetration depth lambda has been measured in both a and b directions in Yba(2)Cu(3)O(6.95). The overall temperature dependences are similar and show a linear behavior at low T. This argues against the chains playing a direct role in the unconventional behavior of the surface impedance. The residual R(s) of these twin-free crystals is very small, implying a residual conductivity of the order of the minimum value predicted by Lee [Phys. Rev. Lett. 71, 1887 (1993)] for a d-wave superconductor.