Anomalous magnetoresistance near the superconductor-insulator transition in ultrathin films of α-MoxSi1-x

被引：63

作者：

Okuma, S ^{[1
]}

Terashima, T ^{[1
]}

Kokubo, N ^{[1
]}

机构：

[1] Tokyo Inst Technol, Res Ctr Very Low Temp Syst, Meguro Ku, Tokyo 1528551, Japan

来源：

PHYSICAL REVIEW B | 1998年 / 58卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.58.2816

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have made systematic studies for both the zero-field and field-driven superconductor-insulator transitions in a series of 4-nm-thick films of amorphous MoxSi1-x at temperatures T down to similar to 0.05 K and fields B up to 15 T. For superconducting films, we have observed an anomalous peak in the magnetoresistance R(B) and a subsequent decrease in R(B) with increasing B at low temperatures in fields higher than the critical field B-xxC. This result, together with finding that the magnetoresistance is always positive for insulating films, may suggest the presence of localized Cooper pairs even at B>B-xxC in the limit of T-->0.

引用

页码：2816 / 2819

页数：4