Pauli-limited upper critical field of Fe1+yTe1-xSex
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Florida State Univ., Tallahassee, FL (United States)
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.
- 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:
- 1064685
- Journal Information:
- Phys. Rev. B, Vol. 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
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