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From the measurement and analysis of the specific heat of high-qualityK_(1-x)Na_xFe_2As_2 single crystals we establish the presence of large T^2contributions with coefficients alpha_sc ~ 30 mJ/mol K^3 at low-T for both x=0and 0.1. Together with the observed square root field behavior of the specificheat in the superconducting state both findings evidence d-wavesuperconductivity on almost all Fermi surface sheets with an average gapamplitude of Delta_0 in the range of 0.4 - 0.8 meV. The derived Delta_0 and theobserved T_c agree well with the values calculated within the Eliashbergtheory, adopting a spin-fluctuation mediated pairing in the intermediatecoupling regime.

Evidence of d-wave Superconductivity in K_(1-x)Na_xFe_2As_2 (x = 0, 0.1) Single Crystals from Low-Temperature Specific Heat Measurements