Strain-driven broken twin boundary coherence in YBa2Cu3O7-δ nanocomposite thin films

被引：40

作者：

Guzman, R. ^{[1
]}

Gazquez, J. ^{[1
,2
]}

Rouco, V. ^{[1
]}

Palau, A. ^{[1
]}

Magen, C. ^{[3
,4
]}

Varela, M. ^{[2
,5
]}

Arbiol, J. ^{[1
,6
]}

Obradors, X. ^{[1
]}

Puig, T. ^{[1
]}

机构：

[1] ICMAB CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Catalonia, Spain

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Univ Zaragoza, Lab Microscopias Avanzadas, Inst Nanociencia Aragon ARAID, Zaragoza 50018, Spain

[4] Univ Zaragoza, Dept Fis Mat Condensada, Zaragoza 50018, Spain

[5] Univ Complutense Madrid, Dept Fis Aplicada 3, E-28040 Madrid, Spain

[6] ICREA, Barcelona 08010, Catalonia, Spain

来源：

APPLIED PHYSICS LETTERS | 2013年 / 102卷 / 08期

关键词：

CRITICAL CURRENTS; SUPERCONDUCTING WIRES; BICRYSTALS; DEFECTS; GROWTH;

D O I：

10.1063/1.4793749

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this letter we use high resolution scanning transmission electron microscopy to study epitaxial YBa2Cu3O7-delta (YBCO) nanocomposite thin films. We find that twin boundaries (TB) in YBCO nanocomposite thin films are disturbed by the presence of secondary phase nanoparticles as well as by intergrowths. Secondary phases promote the nucleation of TBs and, at the same time, result in bending, decreasing and changing the TB's spacing. On the other hand, the local strain ensuing from the partial dislocation associated to Y248 and Y125 intergrowths break the vertical coherence of TBs. This interaction results in a complex domain structure where twin boundary coherence is no longer satisfied and twin spacing is reduced down to a few nanometers precluding vortex channeling at low temperatures. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793749]

引用

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