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Title: Normal state above the upper critical field in Fe 1 + y Te 1 - x ( Se , S ) x

Here, we have investigated the magnetotransport above the upper critical field ( H c 2 ) in Fe 1.14 Te 0.7 Se 0.3 , Fe 1.02 Te 0.61 Se 0.39 , Fe 1.05 Te 0.89 Se 0.11 , and Fe 1.06 Te 0.86 S 0.14 . The μ SR measurements confirm electronic phase separation in Fe 1.06 Te 0.86 S 0.14 , similar to Fe 1 + y Te 1 - x Se x . We found that superconductivity is suppressed in high magnetic fields above 60 T, allowing us to gain insight into the normal-state properties below the zero-field superconducting transition temperature ( T c ). We also show that the resistivity of Fe 1.14 Te 0.7 Se 0.3 and Fe 1.02 Te 0.61 Se 0.39 above H c 2 is metallic as T → 0 , just like the normal-state resistivity above T c . On the other hand, the normal-state resistivity in Fe 1.05 Te 0.89 Se 0.11 and Fe 1.06 Te 0.86 S 0.14 is nonmetallic down to lowest temperatures, reflecting the superconductor-insulator transition due to electronic phase separation.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [3] ;  [4] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  2. Helmholtz-Zentrum Berlin (HZB), (Germany). Hochfeld Magnetlabor Dresden (HLD-EMFL)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Muon Spin Spectroscopy
  4. Helmholtz-Zentrum Berlin (HZB), (Germany). Hochfeld Magnetlabor Dresden (HLD-EMFL); Technical Univ. Dresden (Germany). Inst. for Solid State Physics
Publication Date:
Report Number(s):
BNL-114042-2017-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PM016; KC0201050; TRN: US1702670
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1372446
Alternate Identifier(s):
OSTI ID: 1355072