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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.

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Physical Review B - Condensed Matter and Materials Physics