Volovik effect in a highly anisotropic multiband superconductor: Experiment and theory

Y. Wang, J. S. Kim, G. R. Stewart, P. J. Hirschfeld, S. Graser, S. Kasahara, T. Terashima, Y. Matsuda, T. Shibauchi, I. Vekhter

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We present measurements of the specific heat coefficient γ (C/T) in the low-temperature limit as a function of an applied magnetic field for the Fe-based superconductor BaFe2(As0.7P0.3) 2. We find both a linear regime at higher fields and a limiting square root H behavior at very low fields. The crossover from a Volovik-like √H to a linear field dependence can be understood from a multiband calculation in the quasiclassical approximation assuming gaps with different momentum dependence on the hole- and electronlike Fermi surface sheets.

Original languageEnglish
Article number184524
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number18
DOIs
Publication statusPublished - Nov 17 2011
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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