PERCOLATION EFFECTS AND OXYGEN INHOMOGENEITIES IN YBA2CU3O7-DELTA CRYSTALS

被引:92
作者
OSOFSKY, MS [1 ]
COHN, JL [1 ]
SKELTON, EF [1 ]
MILLER, MM [1 ]
SOULEN, RJ [1 ]
WOLF, SA [1 ]
VANDERAH, TA [1 ]
机构
[1] USN, CTR WEAP, CHINA LAKE, CA 93555 USA
来源
PHYSICAL REVIEW B | 1992年 / 45卷 / 09期
关键词
D O I
10.1103/PhysRevB.45.4916
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The magnetization curves of YBa2Cu3O7-delta crystals are widely observed to exhibit a pronounced low-field minimum in the temperature range 30 K < T < T(c). We demonstrate that these magnetization anomalies correlate with the c-axis lattice parameter, and hence with the specific oxygen deficiency delta. We interpret this low-field feature in terms of a field-induced decoupling of regions of oxygen-rich material by boundaries of oxygen-poor material, a phenomenon reminiscent of the behavior in granular superconductors. A "phase diagram" that demarcates the multigrain onset as a function of temperature and delta is then constructed. The shape of the "phase boundaries" is described using a percolation model. This analysis demonstrates that magnetization is a very sensitive measure of crystal quality.
引用
收藏
页码:4916 / 4922
页数:7
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