High-temperature change of the creep rate in YBa2Cu3O7-δ films with different pinning landscapes

被引：36

作者：

Haberkorn, N. ^{[1
]}

Miura, M. ^{[1
]}

Baca, J. ^{[1
]}

Maiorov, B. ^{[1
]}

Usov, I. ^{[2
]}

Dowden, P. ^{[1
]}

Foltyn, S. R. ^{[1
]}

Holesinger, T. G. ^{[1
]}

Willis, J. O. ^{[1
]}

Marken, K. R. ^{[1
]}

Izumi, T. ^{[3
]}

Shiohara, Y. ^{[3
]}

Civale, L. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Superconduct Technol Ctr, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, MST 7, Los Alamos, NM 87545 USA

[3] Int Superconduct Technol Ctr, Superconduct Res Lab, Koto Ku, Tokyo 1350062, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 17期

关键词：

BA-CU-O; COLUMNAR DEFECTS EVIDENCE; HIGH CRITICAL CURRENTS; CURRENT-DENSITY; SINGLE-CRYSTAL; THIN-FILMS; COATED CONDUCTORS; VORTEX CREEP; SUPERCONDUCTORS; VORTICES;

D O I：

10.1103/PhysRevB.85.174504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic relaxation measurements in YBa2Cu3O7-delta (YBCO) films at intermediate and high temperatures show that the collective vortex creep based on the elastic motion of the vortex lattice has a crossover to fast creep that significantly reduces the superconducting critical current density (J(c)). This crossover occurs at temperatures much lower than the irreversibility field line. We study the influence of different kinds of crystalline defects, such as nanorods, twin boundaries, and nanoparticles, on the high-temperature vortex phase diagram of YBCO films. We found that the magnetization relaxation data is a fundamental tool to understand the pinning at high temperatures. The results indicate that high J(c) values are directly associated with small creep rates. Based on the analysis of the depinning temperature in films with columnar defects, our results indicate that the size of the defects is the relevant parameter that determines thermal depinning at high temperatures. Also, the extension of the collective creep regime depends on the density of the pinning centers.

引用

页数：7

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