Fully Gapped Superconducting State Based on a High Normal State Quasiparticle Density of States in Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ Single Crystals

Simple item page
dc.creatorMu, Gang
dc.creatorLuo, Huiqian
dc.creatorWang, Zhaosheng
dc.creatorShan, Lei
dc.creatorRen, Cong
dc.creatorWen, Hai-Hu
dc.date2008-08-21
dc.date.accessioned2026-07-07T13:10:43Z
dc.date.available2026-07-07T13:10:43Z
dc.descriptionWe report the specific heat (SH) measurements on single crystals of hole doped $FeAs$-based superconductor $Ba_{0.6}K_{0.4}Fe_2As_2$. It is found that the electronic SH coefficient $γ_e(T)$ is not temperature dependent and increases almost linearly with the magnetic field in low temperature region. These point to a fully gapped superconducting state. Surprisingly the sharp SH anomaly $ΔC/T|_{T_c}$ reaches a value of 98 $mJ/mol K^2$ suggesting a very high normal state quasiparticle density of states ($γ_n \approx 63 mJ/mol K^2$). A detailed analysis reveals that the $γ_e(T)$ cannot be fitted with a single gap of s-wave symmetry due to the presence of a hump in the middle temperature region. However, our data indicate that the dominant part of the superconducting condensate is induced by an s-wave gap with the magnitude of about 6 meV.
dc.description5 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/0808.2941
dc.identifierhttp://arxiv.org/abs/0808.2941
dc.identifierPhys. Rev. B 79, 174501 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.174501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229079
dc.subjectSuperconductivity
dc.titleFully Gapped Superconducting State Based on a High Normal State Quasiparticle Density of States in Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ Single Crystals
dc.typetext

Files

Collections

arXiv