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

From the measurement and analysis of the specific heat of high-quality K1−xNaxFe2As2 single crystals we establish the presence of large T2 contributions with coefficients αsc≈30 mJ/mol K3 at low T for both x=0 and x=0.1. Together with the observed √B behavior of the specific heat in the superconduct...

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Main Authors: Mohamed, Mahmoud (Author) , Grinenko, V. (Author) , Aswartham, S. (Author) , Morozov, I. (Author) , Roslova, M. (Author) , Vakaliuk, O. (Author) , Johnston, S. (Author) , Efremov, D. V. (Author) , van den Brink, J. (Author) , Rosner, H. (Author) , Kumar, M. (Author) , Hess, C. (Author) , Wurmehl, S. (Author) , Wolter, A. U. B. (Author) , Büchner, B. (Author) , Green, E. L. (Author) , Wosnitza, J. (Author) , Vogt, P. (Author) , Reifenberger, Andreas (Author) , Enss, Christian (Author) , Hempel, Marius (Author) , Klingeler, Rüdiger (Author) , Drechsler, S.-L. (Author)
Format: Article (Journal)
Language:English
Published: 2013
In: Physical review. B, Condensed matter and materials physics
Year: 2013, Volume: 87, Issue: 18, Pages: 1-4
ISSN:1550-235X
DOI:10.1103/PhysRevB.87.180507
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.87.180507
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.87.180507
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Author Notes:M. Abdel-Hafiez, V. Grinenko, S. Aswartham, I. Morozov, M. Roslova, O. Vakaliuk, S. Johnston, D.V. Efremov, J. van den Brink, H. Rosner, M. Kumar, C. Hess, S. Wurmehl, A.U.B. Wolter, B. Büchner, E.L. Green, J. Wosnitza, P. Vogt, A. Reifenberger, C. Enss, M. Hempel, R. Klingeler, and S.-L. Drechsler
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Summary:From the measurement and analysis of the specific heat of high-quality K1−xNaxFe2As2 single crystals we establish the presence of large T2 contributions with coefficients αsc≈30 mJ/mol K3 at low T for both x=0 and x=0.1. Together with the observed √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 Δ0 in the range of 0.4-0.8 meV. The derived Δ0 and observed Tc agree well with the values calculated within Eliashberg theory, adopting a spin-fluctuation mediated pairing in the intermediate coupling regime.
Item Description:Im Titel ist "1-x", "x" und "2" tiefgestellt
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Physical Description:Online Resource
ISSN:1550-235X
DOI:10.1103/PhysRevB.87.180507

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