Specific heat of FeSe: Two gaps with different anisotropy in superconducting stateстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:We present detailed study of specific heat of FeSe single crystals with critical temperature K at K in magnetic fields T. Analysis of the electronic specific heat at low temperatures shows the coexistence of isotropic s-wave gap and strongly anisotropic extended s-wave gap without nodes. It was found two possibilities of superconducting gap parameters which give equally description of experimental data: (i) two gaps with approximately equal amplitudes and weight contribution to specific heat: isotropic meV (=4.7) and anisotropic gap with the amplitude meV (=4.9 and anisotropy parameter ); (ii) two gaps with substantially different values: isotropic large gap meV () and anisotropic small gap meV () with anisotropy parameter . These results are confirmed by the field behavior of the residual electronic specific heat .