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

doi:10.1103/PhysRevB.84.184524

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

DOI 10.1103/PhysRevB.84.184524 · Physical Review B

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaFe2(As0.7P0.3)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	onset
BaFe2(As1-xPx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	onset
Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown