Is there a Kosterlitz-Thouless transition in YBCO films?

被引：1

作者：

Repaci, JM ^{[1
]}

Kwon, C ^{[1
]}

Li, Q ^{[1
]}

Jiang, X ^{[1
]}

Venkatesan, T ^{[1
]}

Glover, RE ^{[1
]}

Lobb, CJ ^{[1
]}

Newrock, RS ^{[1
]}

机构：

[1] UNIV CINCINNATI, DEPT PHYS, CINCINNATI, OH 45221 USA

来源：

PHYSICA C | 1997年 / 282卷

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0921-4534(97)01145-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Several investigators reported a Kosterlitz-Thouless (KT) transition in Yba(2)Cu(3)O(7-delta) films. Since such films are often in the 3D limit, such a finding is surprising. We performed sensitive measurements on the thinnest possible specimens, single-unit-cell films. Low sensitivity data are roughly consistent with a KT transition. However, IVs at the lowest currents are ohmic at temperatures far below the nominal KT temperature, contrary to the theory. An ohmic response at low currents and temperatures implies the existence of unbound vortices, most likely due to finite size effects.

引用

页码：2081 / 2082

页数：2

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