We report a detailed calorimetric study on single crystals of the 5d-transition metal pnictide SrPt2As2 with a superconducting critical temperature Tc∼5K. The peculiar field dependence of the electronic specific heat coefficient γ can be decomposed into two linear components. Moreover, the temperature evolution of the electronic specific heat below Tc is best described by a two-gap model. These findings suggest that two energy gaps are associated with the superconductivity. In parallel, we show that the spin-lattice relaxation time T1, through nuclear magnetic resonance measurement, obeys the so-called Korringa relation well. This, along with the T2 dependence of resistivity at low temperatures, points to a Fermi liquid ground state in this material.
@article{arxiv.1304.2093,
title = {Evidence for two energy gaps and Fermi liquid behavior in SrPt$_2$As$_2$ superconductor},
author = {Xiaofeng Xu and B. Chen and W. H. Jiao and Bin Chen and C. Q. Niu and Y. K. Li and J. H. Yang and A. F. Bangura and Q. L. Ye and C. Cao and J. H. Dai and Guanghan Cao and N. E. Hussey},
journal= {arXiv preprint arXiv:1304.2093},
year = {2015}
}