Field-tuned superconductor-insulator transition with and without current bias

被引：47

作者：

Bielejec, E ^{[1
]}

Wu, WH ^{[1
]}

机构：

[1] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.88.206802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic-field-tuned superconductor-insulator transition has been studied in ultrathin beryllium films quench condensed near 20 K. In the zero-current limit, a finite-size scaling analysis yields the scaling exponent product nuz=1.35+/-0.10 and a critical sheet resistance, R-c , of about 1.2R(Q) , with R-Q=h/4e(2) . However, in the presence of dc bias currents that are smaller than the zero-field critical currents, nuz becomes 0.75+/-0.10 . This new set of exponents suggests that the field-tuned transitions with and without a dc bias current belong to different universality classes.

引用

页码：4 / 206802

页数：4

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