Volume 111, Number 3, August 2015
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||20 August 2015|
Nanoscale-phase-separation–enhanced critical current and vortex transition temperature in K0.62Fe1.71Se2 crystals
1 Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China - Hefei 230026, PRC
2 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Science Hefei 230026, PRC
3 Collaborative Innovation Center of Advanced Microstructures, Nanjing University - Nanjing 210093, PRC
Received: 11 April 2015
Accepted: 22 July 2015
The critical current and vortex glass (VG) transition of K0.62Fe1.71Se2 crystal have been studied via measuring the current-voltage characteristics by rotating the crystal around its c-axis in magnetic fields parallel to the ab-plane. It is found that the curves show a good three-dimensional VG scaling collapse. The and VG transition temperature exhibit a distinct fourfold symmetry due to the in-plane fourfold superconducting stripe structure in the nanoscale phase-separated system. The is clearly enhanced for fields parallel to the superconducting stripe owning to the increased pinning associated with the nanoscale phase separation.
PACS: 74.25.Uv – Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses) / 74.25.Wx – Vortex pinning (includes mechanisms and flux creep) / 74.25.Sv – Critical currents
© EPLA, 2015
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