Superconducting properties of Pr-based filled skutterudite PrRuAs $_{12}$

Namiki, Takahiro*; Aoki, Yuji*; Sato, Hideyuki*; Sekine, Chihiro*; Shirotani, Ichimin*; Matsuda, Tatsuma; Haga, Yoshinori ; Yagi, Takehiko*

We report on a systematic study of the superconducting characteristics and Pr crystalline-electric-field (CEF) levels of the filled skutterudite PrRuAs $_{12}$ (T = 2.33 K). The electronic specific heat coefficient 95 mJ/(Kmol), which is 1.5 times larger than that of LaRuAs $_{12}$ , indicates 4-originating quasiparticle mass enhancement. The magnetic susceptibility (T) indicates that the CEF ground state is a 1 singlet and a 4(1) triplet first excited state lies at CEF30 K above. A systematic comparison among PrOsSb $_{12}$ , PrRuSb $_{12}$ , PrRuAs $_{12}$ , and La-based reference compounds suggests that the inelastic exchange scattering and aspherical charge scattering of conduction electrons from CEF-split 4 levels play an essential role in the quasiparticle mass enhancement and in determining the value of Tc in the Pr-based filled skutterudites.

Language	:	English
Journal	:	Journal of the Physical Society of Japan
Volume	:	76
Number	:	9
Pages	:	p.093704_1 - 093704_4
Publication Year/Month	:	2007/09
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Paper URL	:	https://doi.org/10.1143/JPSJ.76.093704
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Registration No. : AA20070592
JAEA Abstracts No. : 36000332
Paper Submission No. : 3659

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