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Title: Effects of excess Fe on upper critical field and magnetotransport in Fe 1 + y ( Te 1 - x S x ) z

Abstract

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.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1385911
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 81; Journal Issue: 18; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons, thermal conductivity, energy storage (including batteries and capacitors), superconductivity, defects, spin dynamics

Citation Formats

Lei, Hechang, Hu, Rongwei, Choi, E. S., Warren, J. B., and Petrovic, C. Effects of excess Fe on upper critical field and magnetotransport in Fe1+y(Te1-xSx)z. United States: N. p., 2010. Web. doi:10.1103/PhysRevB.81.184522.
Lei, Hechang, Hu, Rongwei, Choi, E. S., Warren, J. B., & Petrovic, C. Effects of excess Fe on upper critical field and magnetotransport in Fe1+y(Te1-xSx)z. United States. https://doi.org/10.1103/PhysRevB.81.184522
Lei, Hechang, Hu, Rongwei, Choi, E. S., Warren, J. B., and Petrovic, C. Sat . "Effects of excess Fe on upper critical field and magnetotransport in Fe1+y(Te1-xSx)z". United States. https://doi.org/10.1103/PhysRevB.81.184522.
@article{osti_1385911,
title = {Effects of excess Fe on upper critical field and magnetotransport in Fe1+y(Te1-xSx)z},
author = {Lei, Hechang and Hu, Rongwei and Choi, E. S. and Warren, J. B. and Petrovic, C.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.81.184522},
url = {https://www.osti.gov/biblio/1385911}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 18,
volume = 81,
place = {United States},
year = {2010},
month = {5}
}

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