OBSERVATION OF FREE FLUX FLOW AT HIGH DISSIPATION LEVELS IN YBA2CU3O7-BETA EPITAXIAL-FILMS

被引：76

作者：

KUNCHUR, MN ^{[1
]}

CHRISTEN, DK ^{[1
]}

PHILLIPS, JM ^{[1
]}

机构：

[1] AT&T BELL LABS, MURRAY HILL, NJ 07974 USA

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.70.998

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The total resistivity (rho = E/J, not dE/dJ) was measured in epitaxial YBa2Cu3O7-delta films up to high dissipation levels using a pulsed current source. In the reversible region, rho(J) has an S shape; it is Ohmic at low J (thermally activated free flux motion), goes through a nonlinear transition region (depinning), and becomes Ohmic again at the highest J (free flux flow, i.e., purely viscous motion). The free-flux-flow resistivity rho(fff) obeys rho(fff)/rho(n) congruent-to H/H(c2)(T), with dH(c2)/dT almost-equal-to 2 T/K.

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页码：998 / 1001

页数：4

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