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arXiv · 1104.5037

Specific heat jump at superconducting transition in the presence of Spin-Density-Wave in iron-pnictides

M. G. Vavilov·A. V. Chubukov·A. B. Vorontsov
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Abstract

We analyze the magnitude of the specific heat jump ΔC at the superconducting transition temperature T_c in the situation when superconductivity develops in the pre-existing antiferromagnetic phase. We show that ΔC/T_c differs from the BCS value and is peaked at the tri-critical point where this coexistence phase first emerges. Deeper in the magnetic phase, the onset of coexistence, T_c, drops and ΔC/T_c decreases, roughly as ΔC/T_c \propto T^2_c at intermediate T_c and exponentially at the lowest T_c, in agreement with the observed behavior of ΔC/T_c in iron-based superconductors.

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M. G. Vavilov, A. V. Chubukov, A. B. Vorontsov. 2011-04-26. Specific heat jump at superconducting transition in the presence of Spin-Density-Wave in iron-pnictides. https://doi.org/10.1103/physrevb.84.140502

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