The vortex phase transition in BaFe1.8Co0.2As2 single crystals was studied systematically via measuring the current–voltage (I-V) characteristics by rotating the crystals in magnetic fields from H // c to H // ab. The angle-resolved I-V curves clearly show a three-dimensional vortex glass (VG) scaling collapse. The angular dependent VG transition field Hg and critical current density Jc can be approximately described by the anisotropic Ginzburg-Landau model, and no peaks representing c-axis correlated pinning were recorded for H // c, which reveals that the vortex pinning is mainly caused by randomly distributed uncorrelated-defects. While in the vicinity of H // ab, Jc deviates from the model due to the in-plane intrinsic pinning. Based on the above results, the angle-resolved vortex phase diagram is constructed, indicating the anisotropic superconducting properties of the system.
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7 May 2015
Research Article|
May 01 2015
Angle-resolved vortex glass transition and pinning properties in BaFe1.8Co0.2As2 single crystals
F. X. Hao;
F. X. Hao
1Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics,
University of Science and Technology of China
, Hefei 230026, People's Republic of China
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M. J. Zhang;
M. J. Zhang
1Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics,
University of Science and Technology of China
, Hefei 230026, People's Republic of China
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M. L. Teng;
M. L. Teng
1Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics,
University of Science and Technology of China
, Hefei 230026, People's Republic of China
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Y. W. Yin
;
Y. W. Yin
1Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics,
University of Science and Technology of China
, Hefei 230026, People's Republic of China
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W. H. Jiao;
W. H. Jiao
2Department of Physics,
Zhejiang University
, Hangzhou 310027, People's Republic of China
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G. H. Cao;
G. H. Cao
2Department of Physics,
Zhejiang University
, Hangzhou 310027, People's Republic of China
3Collaborative Innovation Center of Advanced Microstructures,
Nanjing University
, Nanjing 210093, People's Republic of China
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X. G. Li
X. G. Li
a)
1Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics,
University of Science and Technology of China
, Hefei 230026, People's Republic of China
3Collaborative Innovation Center of Advanced Microstructures,
Nanjing University
, Nanjing 210093, People's Republic of China
4Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Appl. Phys. 117, 173901 (2015)
Article history
Received:
February 04 2015
Accepted:
April 24 2015
Citation
F. X. Hao, M. J. Zhang, M. L. Teng, Y. W. Yin, W. H. Jiao, G. H. Cao, X. G. Li; Angle-resolved vortex glass transition and pinning properties in BaFe1.8Co0.2As2 single crystals. J. Appl. Phys. 7 May 2015; 117 (17): 173901. https://doi.org/10.1063/1.4919776
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