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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Grinenko, Vadim
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2018Dynamic magnetism in the disordered hexagonal double perovskite BaTi$_{1/2}$Mn$_{1/2}$O$_{3}$citations
- 2018Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin filmscitations
- 2017The influence of the in-plane lattice constant on the superconducting transition temperature of FeSe0.7Te0.3 thin films
- 2016Hall-plot of the phase diagram for Ba(Fe₁₋ₓCoₓ)₂As₂
- 2016Hall-plot of the phase diagram for Ba(Fe1-xCox)2As2citations
- 2016Hall-plot of the phase diagram for Ba(Fe1−xCox)2As2
- 2015High field superconducting properties of Ba(Fe1-xCox)2As2 thin films
- 2015High field superconducting properties of Ba(Fe₁₋ₓCoₓ)₂As₂ thin filmscitations
- 2013Strain induced superconductivity in the parent compound BaFe2As2citations
- 2013Specific heat of Ca$_{0.32}$Na$_{0.68}$Fe$_2$As$_2$ single crystals: unconventional s$_pm$ multi-band superconductivity with intermediate repulsive interband coupling and sizable attractive intraband couplingscitations
- 2011As-vacancies, local moments, and Pauli limiting in LaO_0.9F_0.1FeAs_(1-delta) superconductorscitations
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document
Specific heat of Ca$_{0.32}$Na$_{0.68}$Fe$_2$As$_2$ single crystals: unconventional s$_pm$ multi-band superconductivity with intermediate repulsive interband coupling and sizable attractive intraband couplings
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 $T_c34$\,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 $53$ 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$_$ pairing symmetry and gap magnitudesof 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. ; Comment: 8 Figures, Submitted to PRB