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

Abdel-Hafiez, M.; Grinenko, V.; Aswartham, S.; Morozov, I.; Roslova, M.; Vakaliuk, O.; Johnston, S.; Efremov, D. V.; van den Brink, J.; Rosner, H.; Kumar, M.; Hess, C.; Wurmehl, S.; Wolter, A. U. B.; Büchner, B.; Green, E. L.; Wosnitza, J.; Vogt, P.; Reifenberger, A.; Enss, C.; Hempel, M.; Klingeler, R.; Drechsler, S. L.

doi:10.1103/PhysRevB.87.180507

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Evidence of d-wave superconductivity in K_1-xNa_xFe₂As₂ (x=0,0.1) single crystals from low-temperature specific-heat measurements

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Rosner, H.
Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kumar, M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Abdel-Hafiez, M., Grinenko, V., Aswartham, S., Morozov, I., Roslova, M., Vakaliuk, O., et al. (2013). Evidence of d-wave superconductivity in K_1-xNa_xFe₂As₂ (x=0,0.1) single crystals from low-temperature specific-heat measurements. Physical Review B, 87(18): 180507, pp. 180507-1-180507-4. doi:10.1103/PhysRevB.87.180507.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-1EB8-4

Abstract

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.