SUPERCURRENT DENSITY CORRELATION-FUNCTION OF YBA2CU3O7-DELTA GRAIN-BOUNDARY JOSEPHSON-JUNCTIONS

被引：9

作者：

FROEHLICH, OM

SCHULZE, H

BECK, A

GERDEMANN, R

MAYER, B

GROSS, R

HUEBENER, RP

机构：

[1] Physikalisches Institut, Universitat Tubingen, D - 72076 Tubingen

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

关键词：

D O I：

10.1109/77.403018

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have measured the thermal, noise induced slope Rp(B) of the current-voltage characteristics of YBa2Cu3O7-delta Grain Boundary Josephson Junctions (GBJs) for I-->0 in magnetic fields up to B = 12 T. From the measured Rp(B) dependences the magnetic field dependence of the critical current I-c(B) was derived in the large magnetic field range between 0 and 12 T. Finally, the supercurrent density correlation function was obtained from the I-c(B) dependence using the Wiener-Khinchine relation. By introducing the concept of the bright (BGCF) and dark ground correlation function (DGCF) a spatial filtering of the information on the supercurrent density distribution was obtained. The investigation of the BGCFs and the comparison to DGCFs gives clear evidence that supercurrent density has strong inhomogeneities on small length scales in the nanometer regime.

引用

页码：2188 / 2191

页数：4

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