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Title: Pauli-limited upper critical field of Fe 1 + y Te 1 - x Se x

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics

In this work, we investigated the temperature dependence of the upper critical field μ 0 H c 2 ( T ) of Fe 1.02 ( 3 ) Te 0.61 ( 4 ) Se 0.39 ( 4 ) and Fe 1.05 ( 3 ) Te 0.89 ( 2 ) Se 0.11 ( 2 ) single crystals by measuring the magnetotransport properties in stable dc magnetic fields up to 35 T. Both crystals show that μ 0 H c 2 ( T ) in the a b plane and along the c -axis exhibit saturation at low temperatures. The anisotropy of μ 0 H c 2 ( T ) decreases with decreasing temperature, becoming nearly isotropic when the temperature T → 0 . Furthermore, μ 0 H c 2 ( 0 ) deviates from the conventional Werthamer-Helfand-Hohenberg theoretical prediction values for both field directions. Our analysis indicates that the spin-paramagnetic pair-breaking effect is responsible for the temperature-dependent behavior of μ 0 H c 2 ( T ) in both field directions.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC02-98CH10886
OSTI ID:
1385913
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 81, Issue 9; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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