Superconducting properties of Pr-based Filled skutterudite PrRu$_4$As$_{12}$

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dc.creatorNamiki, T.
dc.creatorAoki, Y.
dc.creatorSato, H.
dc.creatorSekine, C.
dc.creatorShirotani, I.
dc.creatorMatsuda, T. D.
dc.creatorHaga, Y.
dc.creatorYagi, T.
dc.date2007-10-02
dc.date.accessioned2026-07-07T08:33:31Z
dc.date.available2026-07-07T08:33:31Z
dc.descriptionWe report on systematic study of superconducting characteristics and Pr crystalline-electric-field (CEF) levels of filled-skutterudite \pra ($T_{\rm c}$ = 2.33 K). The temperature dependences of the upper critical field $H_{\rm c2}$ and the Ginzburg-Landau (Maki) parameter $κ_2$ suggest an s-wave clean-limit superconductivity. The electronic specific heat coefficient $γ\sim 95$ mJ/K$^2$mol, being $\sim 1.5$ times larger than that for \lra, indicates $4f$-originating quasiparticle mass enhancement. Magnetic susceptibility $χ(T)$ indicates that the CEF ground state is a $Γ_1$ singlet and a $Γ_4^{(1)}$ triplet first excited state lies at $Δ_{\rm CEF}\sim 30$ K above. Systematic comparison among \pos, \prs, \pra and La-based reference compounds suggests that inelastic exchange- and aspherical-charge-scatterings of conduction electrons from CEF-split $4f$ levels play an essential role for the quasiparticle mass enhancement and the value of $T_{\rm c}$ in the Pr-based filled skutterudites.
dc.description4 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0710.0439
dc.identifierhttp://arxiv.org/abs/0710.0439
dc.identifierJ. Phys. Soc. Jpn. 76 (2007) 093704
dc.identifierdoi:10.1143/JPSJ.76.093704
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139155
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleSuperconducting properties of Pr-based Filled skutterudite PrRu$_4$As$_{12}$
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