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

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

2011-04-26

arxiv.org/abs/1104.5037v1

Phys. Rev. B 84, 140502(R) (2011)

Physics

Condensed Matter

Superconductivity

4+ pages, 3 figures

Scientific paper

10.1103/PhysRevB.84.140502

We analyze the magnitude of the specific heat jump \Delta C at the superconducting transition temperature T_c in the situation when superconductivity develops in the pre-existing antiferromagnetic phase. We show that \Delta C/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 \Delta C/T_c decreases, roughly as \Delta C/T_c \propto T^2_c at intermediate T_c and exponentially at the lowest T_c, in agreement with the observed behavior of \Delta C/T_c in iron-based superconductors.

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