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• W1967547149 abstract "We report a low-temperature specific heat study of high-quality single crystals of the heavily hole doped superconductor Ca$_{0.32}$Na$_{0.68}$Fe$_2$As$_2$. This compound exhibits bulk superconductivity with a transition temperature $T_c approx 34$,K, which is evident from the magnetization, transport, and specific heat measurements. The zero field data manifests a significant electronic specific heat in the normal state with a Sommerfeld coefficient $gamma approx 53$ mJ/mol K$^{2}$. Using a multi-band Eliashberg analysis, we demonstrate that the dependence of the zero field specific heat in the superconducting state is well described by a three-band model with an unconventional s$_pm$ pairing symmetry and gap magnitudes $Delta_i$ of approximately 2.35, 7.48, and -7.50 meV. Our analysis indicates a non-negligible attractive intraband coupling,which contributes significantly to the relatively high value of $T_c$. The Fermi surface averaged repulsive and attractive coupling strengths are of comparable size and outside the strong coupling limit frequently adopted for describing high-$T_c$ iron pnictide superconductors. We further infer a total mass renormalization of the order of five, including the effects of correlations and electron-boson interactions." @default.
• W1967547149 created "2016-06-24" @default.
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• W1967547149 date "2014-04-14" @default.
• W1967547149 modified "2023-10-17" @default.
• W1967547149 title "Specific heat of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>Ca</mml:mi><mml:mn>0.32</mml:mn></mml:msub><mml:msub><mml:mi>Na</mml:mi><mml:mn>0.68</mml:mn></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>single crystals: Unconventional<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>s</mml:mi><mml:mo>±</mml:mo></mml:msub></mml:math>multiband …" @default.
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• W1967547149 doi "https://doi.org/10.1103/physrevb.89.134507" @default.
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