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Title: Critical Fields, Thermally Activated Transport, and Critical Current Density of Beta-FeSe Single Crystals

Abstract

We present critical fields, thermally activated flux flow (TAFF), and critical current density of tetragonal phase {beta}-FeSe single crystals. The upper critical fields H{sub c2}(T) for H {parallel} (101) and H {perpendicular} (101) are nearly isotropic and are likely governed by the Pauli limiting process. The large Ginzburg-Landau parameter {Kappa} {approx} 72.3(2) indicates that {beta}-FeSe is a type-II superconductor with a smaller penetration depth than in Fe(Te, Se). The resistivity below T{sub c} follows Arrhenius TAFF behavior. For both field directions below 30 kOe, single-vortex pinning is dominant, whereas collective creep becomes important above 30 kOe. The critical current density J{sub c} from M-H loops for H {parallel} (101) is about five times larger than for H {perpendicular} (101), yet much smaller than in other iron-based superconductors.

Authors:
; ;
Publication Date:
Research Org.:
BROOKHAVEN NATIONAL LABORATORY (BNL)
Sponsoring Org.:
DOE - OFFICE OF SCIENCE
OSTI Identifier:
1033200
Report Number(s):
BNL-96343-2011-JA
Journal ID: ISSN 1098-0121; R&D Project: PO-013; KC0202010; TRN: US1200300
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CREEP; CRITICAL CURRENT; CRITICAL FIELD; MONOCRYSTALS; PENETRATION DEPTH; SUPERCONDUCTORS; TRANSPORT; TYPE-II SUPERCONDUCTORS; critical fields; thermally activated transport; critical current density; single crystals; iron-based superconductors

Citation Formats

Petrovic, C., Lei, H., and Hu, R. Critical Fields, Thermally Activated Transport, and Critical Current Density of Beta-FeSe Single Crystals. United States: N. p., 2011. Web.
Petrovic, C., Lei, H., & Hu, R. Critical Fields, Thermally Activated Transport, and Critical Current Density of Beta-FeSe Single Crystals. United States.
Petrovic, C., Lei, H., and Hu, R. Wed . "Critical Fields, Thermally Activated Transport, and Critical Current Density of Beta-FeSe Single Crystals". United States.
@article{osti_1033200,
title = {Critical Fields, Thermally Activated Transport, and Critical Current Density of Beta-FeSe Single Crystals},
author = {Petrovic, C. and Lei, H. and Hu, R.},
abstractNote = {We present critical fields, thermally activated flux flow (TAFF), and critical current density of tetragonal phase {beta}-FeSe single crystals. The upper critical fields H{sub c2}(T) for H {parallel} (101) and H {perpendicular} (101) are nearly isotropic and are likely governed by the Pauli limiting process. The large Ginzburg-Landau parameter {Kappa} {approx} 72.3(2) indicates that {beta}-FeSe is a type-II superconductor with a smaller penetration depth than in Fe(Te, Se). The resistivity below T{sub c} follows Arrhenius TAFF behavior. For both field directions below 30 kOe, single-vortex pinning is dominant, whereas collective creep becomes important above 30 kOe. The critical current density J{sub c} from M-H loops for H {parallel} (101) is about five times larger than for H {perpendicular} (101), yet much smaller than in other iron-based superconductors.},
doi = {},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}