Effects of excess Fe on upper critical field and magnetotransport in Fe1+y(Te1-xSx)z

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

doi:10.1103/PhysRevB.81.184522

Effects of excess Fe on upper critical field and magnetotransport in ${Fe}_{1 + y} {({Te}_{1 - x} S_{x})}_{z}$

Journal Article · Sat May 01 04:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.81.184522· OSTI ID:1385911

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

We have investigated the upper critical field anisotropy and magnetotransport properties of Fe 1.14 ( 1 ) Te 0.91 ( 2 ) S 0.09 ( 2 ) single crystals in stable magnetic fields up to 35 T. The results show that μ 0 H c 2 ( T ) along the c axis and in the a b plane exhibit saturation at low temperatures. The anisotropy of μ 0 H c 2 ( T ) decreases with decreasing temperature, becoming nearly isotropic for T → 0 . Our analysis indicates that the spin-paramagnetic pair breaking with spin-orbital scattering is responsible for the behavior of μ 0 H c 2 ( T ) . Furthermore, from analysis of the normal-state properties, we show evidence that the excess Fe is a key factor determining the normal- and superconducting-state physical properties.

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:: 1385911

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 81; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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