Evidence of d-wave superconductivity in K1-xNaxFe2As2 (x=0,0.1) single crystals from low-temperature specific-heat measurements

Article

关键词: THERMODYNAMICS;    KFE2AS2;   

DOI  :  10.1103/PhysRevB.87.180507

来源: SCIE

【 摘 要 】

From the measurement and analysis of the specific heat of high-quality K1- xNaxFe2As2 single crystals we establish the presence of large T-2 contributions with coefficients alpha(sc) approximate to 30 mJ/mol K-3 at low T for both x = 0 and x = 0.1. Together with the observed root B behavior of the specific heat in the superconducting state both findings give evidence of d-wave superconductivity on almost all Fermi-surface sheets with an average gap amplitude of Delta(0) in the range of 0.4-0.8 meV. The derived Delta(0) and observed T-c agree well with the values calculated within Eliashberg theory, adopting a spin-fluctuation mediated pairing in the intermediate coupling regime.

【 授权许可】

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