Specific heat jump at superconducting transition in the presence of Spin-Density-Wave in iron-pnictides
Abstract
We analyze the magnitude of the specific heat jump C at the superconducting transition temperature Tc in the situation when superconductivity develops in the pre-existing antiferromagnetic phase. We show that C/Tc 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, Tc, drops and C/Tc decreases, roughly as C/Tc T2c at intermediate Tc and exponentially at the lowest Tc, in agreement with the observed behavior of C/Tc in iron-based superconductors.
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