| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Hess, C.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 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
- 2010Nonresonant x-ray magnetic scattering on rare-earth iron borates R Fe 3(BO3)4citations
- 2010Upper critical fields up to 60 T and the vortex matter phase diagram of arsenic-deficient LaO<inf>0.9</inf>F<inf>0.1</inf>FeAs<inf>1-δ</inf>citations
- 2008Erratum: High-field pauli-limiting behavior and strongly enhanced upper critical magnetic fields near the transition temperature of the arsenic-deficient LaO0.9F0.1FeAs1-δ superconductor (Phys. Rev. Lett. (2008) 101 237003))citations
- 2008High-field pauli-limiting behavior and strongly enhanced upper critical magnetic fields near the transition temperature of an arsenic-deficient LaO0.9F0.1FeAs1-δ superconductorcitations
Places of action
| Organizations | Location | People |
|---|
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