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Title: Pauli-limited upper critical field of Fe 1+yTe 1-xSe x

Abstract

In this work, we investigated the temperature dependence of the upper critical field μ 0H c2(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 0H c2(T) in the ab plane and along the c-axis exhibit saturation at low temperatures. The anisotropy of μ 0H c2(T) decreases with decreasing temperature, becoming nearly isotropic when the temperature T→0. Furthermore, μ 0H c2(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 0H c2(T) in both field directions.

Authors:
 [1];  [1];  [2];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Florida State Univ., Tallahassee, FL (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC); Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1064685
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B
Additional Journal Information:
Journal Volume: 81; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory
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, Cedomir. Pauli-limited upper critical field of Fe1+yTe1-xSex. United States: N. p., 2010. Web. doi:10.1103/PhysRevB.81.094518.
Lei, Hechang, Hu, Rongwei, Choi, E. S., Warren, J. B., & Petrovic, Cedomir. Pauli-limited upper critical field of Fe1+yTe1-xSex. United States. https://doi.org/10.1103/PhysRevB.81.094518
Lei, Hechang, Hu, Rongwei, Choi, E. S., Warren, J. B., and Petrovic, Cedomir. Mon . "Pauli-limited upper critical field of Fe1+yTe1-xSex". United States. https://doi.org/10.1103/PhysRevB.81.094518.
@article{osti_1064685,
title = {Pauli-limited upper critical field of Fe1+yTe1-xSex},
author = {Lei, Hechang and Hu, Rongwei and Choi, E. S. and Warren, J. B. and Petrovic, Cedomir},
abstractNote = {In this work, we investigated the temperature dependence of the upper critical field μ0Hc2(T) of Fe1.02(3)Te0.61(4)Se0.39(4) and Fe1.05(3)Te0.89(2)Se0.11(2) single crystals by measuring the magnetotransport properties in stable dc magnetic fields up to 35 T. Both crystals show that μ0Hc2(T) in the ab plane and along the c-axis exhibit saturation at low temperatures. The anisotropy of μ0Hc2(T) decreases with decreasing temperature, becoming nearly isotropic when the temperature T→0. Furthermore, μ0Hc2(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 μ0Hc2(T) in both field directions.},
doi = {10.1103/PhysRevB.81.094518},
url = {https://www.osti.gov/biblio/1064685}, journal = {Phys. Rev. B},
number = ,
volume = 81,
place = {United States},
year = {2010},
month = {3}
}