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論文

Abnormally enhanced diamagnetism in Al-Zn-Mg alloys

西村 克彦*; 松田 健二*; Lee, S.*; 布村 紀男*; 島野 寛基*; Bendo, A.*; 渡邊 克己*; 土屋 大樹*; 並木 孝洋*; 戸田 裕之*; et al.

Journal of Alloys and Compounds, 774, p.405 - 409, 2019/02

 パーセンタイル:100(Chemistry, Physical)

Temperature and time dependences of magnetization of Al-1.0%Zn-4.2%Mg, Al-2.6%Zn-3.2%Mg, Al-4.1%Zn-1.1%Mg, and Al-5%Zn (at.%) alloys were measured in the range between 10 and 310 K after various periods of natural aging and peak-aged heat treatments. Enhanced diamagnetic contributions on the magnetization were observed for the as-quenched Al-Zn-Mg alloys for the first time. The enhanced diamagnetism observed in Al-2.6%Zn-3.2%Mg and Al-4.1%Zn-1.1%Mg were found to largely alter in natural aging, while that of Al-1.0%Zn-4.2%Mg little changed. After peak-aged heat treatments, the diamagnetism of Al-Zn-Mg was largely reduced. The binary Al-5%Zn showed neither enhanced diamagnetism nor natural aging effect on the magnetization. Isothermal time variations of magnetization of Al-Zn-Mg alloys at 300 K were found to be related with solute-vacancy clustering.

論文

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

並木 孝洋*; 青木 勇二*; 佐藤 英行*; 関根 ちひろ*; 城谷 一民*; 松田 達磨; 芳賀 芳範; 八木 健彦*

Journal of the Physical Society of Japan, 76(9), p.093704_1 - 093704_4, 2007/09

 被引用回数:28 パーセンタイル:20.93(Physics, Multidisciplinary)

We report on a systematic study of the superconducting characteristics and Pr crystalline-electric-field (CEF) levels of the filled skutterudite PrRu$$_4$$As$$_{12}$$ (T$$_c$$ = 2.33 K). The electronic specific heat coefficient $$gamma sim$$95 mJ/(K$$^2cdot$$mol), which is $$sim$$1.5 times larger than that of LaRu$$_4$$As$$_{12}$$, indicates 4$$f$$-originating quasiparticle mass enhancement. The magnetic susceptibility $$chi$$(T) indicates that the CEF ground state is a $$Gamma$$1 singlet and a $$Gamma$$4(1) triplet first excited state lies at $$Delta$$CEF$$sim$$30 K above. A systematic comparison among PrOs$$_4$$Sb$$_{12}$$, PrRu$$_4$$Sb$$_{12}$$, PrRu$$_4$$As$$_{12}$$, and La-based reference compounds suggests that the inelastic exchange scattering and aspherical charge scattering of conduction electrons from CEF-split 4$$f$$ levels play an essential role in the quasiparticle mass enhancement and in determining the value of Tc in the Pr-based filled skutterudites.

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