Sang, Lina and Shabbir, Babar and Maheshwari, Pankaj and Qiu, Wenbin and Ma, Zongqing and Dou, Shixue and Cai, Chuanbing and Awana, V. P. S. and Wang, Xiaolin (2018) Hydrostatic pressure-induced huge enhancement of critical current density and flux pinning in Fe1-xCoxSe0.5Te0.5 single crystals. Superconductor Science and Technology , 31 (2). 025009-025018. ISSN 0953-2048

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Abstract

We performed a systematic study of the hydrostatic pressure (HP) effect on the superconducting transition temperature (T-c), critical current density (J(c)), irreversibility field (H-irr), upper critical field (H-c2), and flux pinning mechanism in un-doped and 3 at.% Co-doped FeSe0.5Te0.5 crystals. We found that T-c is increased from 11.5 to 17 K as HP increases from 0 to 1.2 GPa. Remarkably, the J(c) is significantly enhanced by a factor of 3 to 100 for low and high temperature and field, and the H-irr line is shifted to higher fields by HP up to 1.2 GPa. Based on the collective pinning model, the delta l pinning associated with charge-carrier mean free path fluctuation is responsible for the pinning mechanism of Fe1-xCoxSe0.5Te0.5 samples with or without pressure. A comprehensive vortex phase diagram in the mixed state is constructed and analysed for the 3 at.% Co-doped sample.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Institute of Physics.
Subjects:	Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	18 Dec 2019 06:54
Last Modified:	18 Dec 2019 06:54
URI:	http://npl.csircentral.net/id/eprint/3787

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