Effect of SDW fluctuations on the specific heat jump in iron pnictides at a superconducting transition
arXiv:1401.1118 · doi:10.1103/PhysRevB.89.144503
Abstract
Measurements of the specific heat jump at the onset of superconducting transition in the iron-pnictide compounds revealed strong variation of its magnitude as a function of doping that is peaked near the optimal doping. We show that this behavior is direct manifestation of the coexistence between spin-density-wave and superconducting orders and the peak originates from thermal fluctuations of the spin-density-waves near the end point of the coexistence phase -- a tetracritical point. Thermal fluctuations result in a power-law dependence of the specific heat jump that is stronger than the contribution of mass renormalization due to quantum fluctuations of spin-density-waves in the vicinity of the putative critical point beneath the superconducting dome.
8 pages, 3 figures. Submitted to Phys. Rev. B
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