Dimensional cross-over in the superconducting state of oxygen-deficient YBa2Cu3O6.7

被引:3
作者
Hussey, NE
Cooper, JR
Chen, CK
Hodby, JW
机构
[1] Univ Cambridge, Interdisciplinary Res Ctr Superconduct, Cambridge CB3 0HE, England
[2] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England
来源
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1997年 / 292卷 / 3-4期
基金
英国工程与自然科学研究理事会;
关键词
magnetization; Josephson effect; coherence;
D O I
10.1016/S0921-4534(97)01656-0
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have investigated the dimensionality of the superconducting state in oxygen reduced YBa2Cu3O6.7 (T-c = 63 K) via measurements of the low-field magnetization M(H) with the field applied parallel to the CuO2-planes. At low temperatures, the c-axis surface screening currents are found to be strongly suppressed by vortices penetrating between the planes, indicating that the individual CuO2-planes are weakly coupled via the Josephson interaction, Since in optimally doped YBa2Cu3O7, the M(H) behaviour is consistent with anisotropic three-dimensional superconductivity, these observations clearly demonstrate that the removal of oxygen from the chains results in a dimensional cross-over of the superconducting state in YBa2Cu3O7-delta. On raising the temperature towards T-c, three-dimensional behaviour is again observed in YBa2Cu3O6.7 when the c-axis coherence length becomes comparable to the interlayer spacing. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:218 / 224
页数:7
相关论文
共 24 条
[21]   THEORY OF VORTICES IN WEAKLY-JOSEPHSON-COUPLED LAYERED SUPERCONDUCTORS [J].
THEODORAKIS, S .
PHYSICAL REVIEW B, 1990, 42 (16) :10172-10177
[22]  
WELP U, 1992, HIGH TEMPERATURE SUP
[23]   c axis superfluid response of copper oxide superconductors [J].
Xiang, T ;
Wheatley, JM .
PHYSICAL REVIEW LETTERS, 1996, 77 (22) :4632-4635
[24]   JOSEPHSON DECOUPLING IN SINGLE-CRYSTAL ND1.85CE0.15CU2O4-Y SUPERCONDUCTORS [J].
ZUO, F ;
KHIZROEV, S ;
JIANG, XG ;
PENG, JL ;
GREENE, RL .
PHYSICAL REVIEW LETTERS, 1994, 72 (11) :1746-1749