Critical current density and pinning potential in YBa2Cu3O7-δ thick films ablated from a BaZrO3-doped nanocrystalline target

被引：20

作者：

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

Kechik, M. M. Awang ^{[1
]}

Mikheenko, P. ^{[1
]}

Dang, V. S. ^{[1
]}

Sarkar, A. ^{[1
]}

Abell, J. S. ^{[1
]}

Paturi, P. ^{[3
]}

Huhtinen, H. ^{[3
]}

机构：

[1] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

[2] Natl Inst Mat Phys, Bucharest 077125, Romania

[3] Univ Turku, Dept Phys & Astron, Wihuri Phys Lab, FI-20014 Turku, Finland

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2009年 / 22卷 / 04期

关键词：

HIGH-TEMPERATURE SUPERCONDUCTORS; FLUX CREEP; CENTERS; NANODOTS; NANORODS; DEFECTS;

D O I：

10.1088/0953-2048/22/4/045014

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on the pulsed laser deposition and characterization of thick (1.27 mu m) films ablated from a nanocrystalline YBa2Cu3O7-delta (YBCO) target doped with 4 wt% BaZrO3 (BZO), nYBCO/BZO. DC magnetization measurements have shown a four-to five-fold increase in the critical current density J(c) and a three- to four-fold increase in the maximum pinning force in comparison with 1 mu m thick films grown from a commercial microcrystalline YBCO target, at both 77.3 and 65 K. We have found that the frequency-dependent critical current densities J(c)(f(0)/f) estimated from susceptibility measurements are linear in a double-logarithmic plot ( where f is the frequency of the AC field and f(0) is a macroscopic attempt frequency of about 10(6) Hz), consistent with a logarithmic dependence of the pinning potential on the current density, and are again several times higher in nYBCO/BZO thick films. From the slopes of the J(c)(f(0)/f) dependences we have also estimated the values of pinning potentials in fields between 3 and 5 T.

引用

页数：5

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