Magnetoresistance anomalies in ultra-thin granular YBa2Cu3O7-δ bridges

被引：4

作者：

Levi, D. ^{[1
,2
]}

Shaulov, A. ^{[1
,2
]}

Koren, G. ^{[3
]}

Yeshurun, Y. ^{[1
,2
]}

机构：

[1] Bar Ilan Univ, Dept Phys, Inst Superconduct, IL-52900 Ramat Gan, Israel

[2] Bar Ilan Univ, Dept Phys, Inst Nanotechnol & Adv Mat, IL-52900 Ramat Gan, Israel

[3] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2013年 / 495卷

基金：

以色列科学基金会;

关键词：

Magnetoresistance; Granular superconductors; YBa2Cu3O7-delta bridges; NEGATIVE MAGNETORESISTANCE; MAGNETIC-FIELD; SUPERCONDUCTORS; STATE; WIRES; TRANSITION; TRANSPORT;

D O I：

10.1016/j.physc.2013.07.012

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on magnetoresistance measurements in 10 nm thick and submicron-wide granular YBa2Cu3O7-delta bridges. The results show a strong dependence of the resistance on the magnetic field at low fields crossing over to a relatively weak field dependence at high fields. The field derivative of the resistance at high fields decreases as the temperature is lowered and eventually changes sign, exhibiting a negative slope in a wide field range in the Tesla regime. This negative slope is sensitive to the bias current, turning to be positive as the bias current increases. This complex magnetoresistance behavior is attributed to both phase slips in a distribution of strongly and weakly linked superconducting grains, and tunneling of quasiparticles between grains. The latter dominates at low temperatures and high fields, giving rise to the negative magnetoresistance slope. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：39 / 43

页数：5

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