Influence of defect-induced biaxial strain on flux pinning in thick YBa2Cu3O7 layers

被引：18

作者：

Solovyov, Vyacheslav F. ^{[1
]}

Li, Qiang ^{[1
]}

Si, Weidong ^{[1
]}

Maiorov, Boris ^{[2
]}

Haugan, Timothy J. ^{[3
]}

MacManus-Driscoll, J. L. ^{[4
]}

Yao, H. ^{[5
]}

Jia, Q. X. ^{[2
]}

Specht, E. D. ^{[6
]}

机构：

[1] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[2] Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA

[3] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA

[4] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

[5] Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China

[6] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 09期

关键词：

CRITICAL-CURRENT DENSITY; SUPERCONDUCTOR YBA2CU4O8; CRITICAL CURRENTS; FILMS; TEMPERATURE; CONDUCTORS; DEPENDENCE; GROWTH; FIELD;

D O I：

10.1103/PhysRevB.86.094511

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This work reports a detailed structural study by synchrotron x-ray diffraction of several sets of thick YBa2Cu3O7 layers. The samples represent recent advances in flux-pinning design, containing various concentrations of artificial pinning centers: (i) BaZrO3 nanorods, (ii) BaZrO3 nanoparticles, and (iii) Y2O3 nanoparticles. A statistical analysis was performed in order to separate the effects of defect-induced and intrinsic pinning. We report a statistically significant correlation between the orthorhombic distortion of the YBCO matrix and the pinning strength. Our result implies that the in-plane ordering of oxygen ions in the chain positions accounts for approximately 60% of the pinning force. The strain-induced pinning mechanism analysis, based on the Eshelby model of elastically strained composites, predicts that small YBCO grain size is a critical component of a strong pinning architecture that can enable critical current density values approaching the depairing limit.

引用

页数：5

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