Physics – Condensed Matter – Superconductivity
Scientific paper
2011-09-02
Phys. Rev. B 84, 184524 (2011)
Physics
Condensed Matter
Superconductivity
11 pages, 8 figures, 1 table, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.84.184524
We present measurements of the specific heat coefficient \gamma(= C/T) in the low temperature limit as a function of an applied magnetic field for the Fe-based superconductor BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$. 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 $\sqrt{H}$ 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 electron-like Fermi surface sheets.
Graser Siegfried
Hirschfeld Peter J.
Kasahara Satoshi
Kim Jinyoung Serena
Matsuda Yuichi
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