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24 April 2024

» arxiv » 1109.5225

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Low temperature specific-heat measurements of a coexistence of isotropic and extended s-wave order parameters in superconducting FeSe single crystals
J.-Y. Lin ; Y. S. Hsieh ; D. A. Chareev ; A. N. Vasiliev ; Y. Parsons ; H. D. Yang ;
Date:	24 Sep 2011
Abstract:	The comprehensive low-temperature specific heat C(T) data identify both an isotropic s-wave and an extended s-wave order parameters coexisting in a superconducting single crystal FeSe with Tc=8.11 K. The isotropic gap {Delta}0=1.33 meV on the hole Fermi sheets and the extended s-wave gap {Delta}={Delta}e(1+alpha*cos2_theta) with {Delta}e=1.13 meV and alpha=0.78 on the electron Fermi sheets. The extended s-wave is rather anisotropic but the low energy quasiparticle excitations demonstrate no sign of the accidental nodes. The coefficient gamma(H) manifesting the quasiparticle contribution to C is a non-linear function of the applied magnetic field H in the mixed state in accord with the anisotropic multi-order parameters.
Source:	arXiv, 1109.5225
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