Evolution of the Pauli spin-paramagnetic effect on the upper critical fields of single-crystalline KxFe2-ySe2-zSz

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • F. Wolff-Fabris - , Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Hechang Lei - , Brookhaven National Laboratory (Author)
  • J. Wosnitza - , Chair of Physics of High Magnetic Fields, Helmholtz-Zentrum Dresden-Rossendorf, TUD Dresden University of Technology (Author)
  • C. Petrovic - , Brookhaven National Laboratory (Author)

Abstract

We have studied the temperature dependence of the upper critical fields μ0Hc2 of KxFe2-ySe2-zSz single crystals up to 60 T. The μ0Hc2 for H∥ab and H∥c decrease with increasing sulfur content. The detailed analysis using Werthamer-Helfand-Hohenberg theory including the Pauli spin-paramagnetic effect shows that μ0Hc2 for H∥ab is dominated by the spin-paramagnetic effect, which diminishes with higher S content, whereas μ0Hc2 for H∥c shows a linear temperature dependence with an upturn at high fields. The latter observation can be ascribed to multiband effects that become weaker for higher S content. This results in an enhanced anisotropy of μ0Hc2 for high S content due to the different trends of the spin-paramagnetic and multiband effect for H∥ab and H∥c, respectively.

Details

Original languageEnglish
Article number024505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number2
Publication statusPublished - 10 Jul 2014
Peer-reviewedYes