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

Authors

Y. Wang, University of Florida
J. S. Kim, University of Florida
G. R. Stewart, University of Florida
P. J. Hirschfeld, University of Florida
S. Graser, Universität Augsburg
S. Kasahara, Research Center for Low Temperature and Materials Sciences
T. Terashima, Research Center for Low Temperature and Materials Sciences
Y. Matsuda, Kyoto University
T. Shibauchi, Kyoto University
I. Vekhter, Louisiana State University

Document Type

Article

Publication Date

11-17-2011

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. © 2011 American Physical Society.

Publication Source (Journal or Book title)

Physical Review B - Condensed Matter and Materials Physics

Recommended Citation

Wang, Y., Kim, J., Stewart, G., Hirschfeld, P., Graser, S., Kasahara, S., Terashima, T., Matsuda, Y., Shibauchi, T., & Vekhter, I. (2011). Volovik effect in a highly anisotropic multiband superconductor: Experiment and theory. Physical Review B - Condensed Matter and Materials Physics, 84 (18) https://doi.org/10.1103/PhysRevB.84.184524