Low temperature specific heat of the hole-doped Ba_{0.6}K_{0.4}Fe_2As_2 single crystals and electron-doped SmFeAsO_{0.9}F_{0.1} samples

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dc.creatorMu, Gang
dc.creatorLuo, Huiqian
dc.creatorWang, Zhaosheng
dc.creatorRen, Zhian
dc.creatorShan, Lei
dc.creatorRen, Cong
dc.creatorWen, Hai-Hu
dc.date2008-12-05
dc.date.accessioned2026-07-07T13:10:44Z
dc.date.available2026-07-07T13:10:44Z
dc.descriptionLow temperature specific heat (SH) was measured on the FeAs-based superconducting single crystals Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ and high pressure synthesized polycrystalline samples SmFeAsO$_{0.9}$F$_{0.1}$. It is found that the sharp SH anomaly $ΔC/T|_{T_c}$ in Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ reaches an unexpected high value of 98 mJ/mol K$^2$, about one order of magnitude larger than that of SmFeAsO$_{0.9}$F$_{0.1}$ ($6\sim8$ mJ/mol K$^2$) samples, suggesting very high normal state quasiparticle density of states in FeAs-122 than in FeAs-1111. Furthermore, we found that the electronic SH coefficient $γ_e(T)$ of Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ is weakly temperature dependent and increases almost linearly with the magnetic field in low temperature region, which may indicate that the hole-doped FeAs-122 system contains a dominant component with a full superconducting gap, although we cannot rule out the possibility of a small component with anisotropic or nodal gap. A detailed analysis reveals that the $γ_e(T)$ of Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ cannot be fitted with a single gap of s-wave symmetry probably due to the multigap effect. These results indicate clear difference between the properties of the superconducting state of the holed-doped Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ and the F-doped LnFeAsO (Ln = rare earth elements) systems, which we believe is originated from the complex Fermi surface structures in different systems.
dc.description9 pages, 10 figures
dc.identifierhttps://arxiv.org/abs/0812.1188
dc.identifierhttp://arxiv.org/abs/0812.1188
dc.identifierPhys. Rev. B 79, 174501 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.174501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229082
dc.subjectSuperconductivity
dc.titleLow temperature specific heat of the hole-doped Ba_{0.6}K_{0.4}Fe_2As_2 single crystals and electron-doped SmFeAsO_{0.9}F_{0.1} samples
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