Pauli-limited upper critical field of Fe1+yTe1-xSex

Lei, Hechang; Hu, Rongwei; Choi, E. S.; Warren, J. B.; Petrovic, C.

doi:10.1103/PhysRevB.81.094518

Pauli-limited upper critical field of ${Fe}_{1 + y} {Te}_{1 - x} {Se}_{x}$

Journal Article · Mon Mar 01 04:00:00 EST 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.81.094518· OSTI ID:1385913

Lei, Hechang; Hu, Rongwei; Choi, E. S.; Warren, J. B.; Petrovic, C.

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 SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385913

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 9 Vol. 81; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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