Electronic specific heat in BaFe2−xNixAs2


We have systematically studied the low-temperature specific heat of the BaFe2−xNixAs2 single crystals covering the whole superconducting dome. Using the nonsuperconducting heavily overdoped x=0.3 sample as a reference for the phonon contribution to the specific heat, we find that the normal-state electronic specific heats in the superconducting samples may have a nonlinear temperature dependence, which challenges previous results in the electron-doped Ba-122 iron-based superconductors. A model based on the presence of ferromagnetic spin fluctuations may explain the data between x=0.1 and x=0.15, suggesting the important role of Fermi-surface topology in understanding the normal-state electronic states.

Journal article

Gong, Dongliang, Xie, Tao, Lu, Xingye, et al.. "Electronic specific heat in BaFe2−xNixAs2." Physical Review B, 93, no. 13 (2016) American Physical Society: http://dx.doi.org/10.1103/PhysRevB.93.134520.

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