Nanoscale-phase-separation–enhanced critical current and vortex transition temperature in K0.62Fe1.71Se2 crystals

Meng Li Teng; Ming Jia Zhang; Fei Xiang Hao; Yue Wei Yin; Xiao Guang Li

doi:10.1209/0295-5075/111/37001

All issues

Volume 111 / No 3 (August 2015)

EPL, 111 3 (2015) 37001

Abstract

Issue		EPL Volume 111, Number 3, August 2015


Article Number		37001
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/111/37001
Published online		20 August 2015

EPL, 111 (2015) 37001

Nanoscale-phase-separation–enhanced critical current and vortex transition temperature in K_0.62Fe_1.71Se₂ crystals

Meng Li Teng¹, Ming Jia Zhang¹, Fei Xiang Hao¹, Yue Wei Yin¹ and Xiao Guang Li¹^,2^,3^(a)

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

^(a) lixg@ustc.edu.cn

Received: 11 April 2015
Accepted: 22 July 2015

Abstract

The critical current $I_{c}$ and vortex glass (VG) transition of K_0.62Fe_1.71Se₂ crystal have been studied via measuring the current-voltage $(I\text{-}V)$ characteristics by rotating the crystal around its c-axis in magnetic fields parallel to the ab-plane. It is found that the $I\text{-}V$ curves show a good three-dimensional VG scaling collapse. The $I_{c}$ and VG transition temperature $T_{g}$ exhibit a distinct fourfold symmetry due to the in-plane fourfold superconducting stripe structure in the nanoscale phase-separated system. The $I_{c}$ is clearly enhanced for fields parallel to the superconducting stripe owning to the increased $\delta T_{c}$ 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

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.