Superconducting Properties of Pr-Based Filled Skutterudite PrRu_4As_<12>(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• We report on a systematic study of the superconducting characteristics and Pr crystalline-electric-field (CEF) levels of the filled skutterudite PrRu 4As 12 (T_C=2.33K). The temperature dependences of the upper critical field H_<c2> and the Ginzburg-Landau (Maki) parameter κ_2 suggest s-wave clean-limit superconductivity. The electronic specific heat coefficient γ〜95mJ/(K^2・mol), which is 〜1.5 times larger than that of LaRu_4As_<12>, indicates 4f-originating quasiparticle mass enhancement. The 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_<CEF>〜30K above. A systematic comparison among PrOs_4Sb_12, PrRu_4Sb_<12>, PrRu_4As_<12>, and Labased reference compounds suggests that the inelastic exchange scattering and aspherical charge scattering of conduction electrons from CEF-split 4f levels play an essential role in the quasiparticle mass enhancement and in determining the value of T_C in the Pr-based filled skutterudites.

• 社団法人日本物理学会の論文
• 2007-09-15

著者

• SATO Hideyuki

  Department of Physics, Tokyo Metropolitan University

• AOKI Yuji

  Department of Physics, Tokyo Metropolitan University

• MATSUDA Tatsuma

  Advanced Science Research Center, Japan Atomic Energy Research Institute

• HAGA Yoshinori

  Advanced Science Research Center, Japan Atomic Energy Research Institute

• 斯波 弘行

  Department Of Physics Tokyo Metropolitan University

• Sakata-haga Hiromi

  Department Of Anatomy And Developmental Neurobiology Institute Of Health Biosciences The University

• 仲間 隆男

  琉球大理

• NAMIKI Takahiro

  Faculty of Engineering Science, Muroran Institute of Technology

• SEKINE Chihiro

  Faculty of Engineering Science, Muroran Institute of Technology

• SHIROTANI Ichimin

  Faculty of Engineering Science, Muroran Institute of Technology

• YAGI Takehiko

  Institute for Solid State Physics, University of Tokyo

• Sekine Chihiro

  Faculty Of Engineering Muroran Institute Of Technology

• Sekine Chihiro

  Muroran Institute Of Technology

• Sato H

  Graduate School Of Science Osaka University

• Yagi Takehiko

  Institute For Solid State Physics The University Of Tokyo

• Nakama T

  Graduate School Of Science Tokyo Metropolitan University

• Aoki Yuji

  Department Of Chemistry Faculty Of Science Gakushuin University

• Sugawara H

  Faculty Of Integrated Arts And Sciences The University Of Tokushima

• Toyota N

  Physics Department Graduate School Of Science Tohoku University

• Haga Yoshinori

  Advanced Science Research Center Japan Atomic Energy Research Institute

• 斯波 弘行

  東京工大

• Shiba Haruya

  Department Of Electrical And Electronic Engineering Faculty Of Engineering The University Of Tokushi

• Shiba Hiroyuki

  Department Of Physics Tokyo Institute Of Technologt

• Sugawara Hitoshi

  Faculty Of Integrated Arts And Science University Of Tokushima:graduate School Of Science Tokyo Metr

• Shirotani I

  Department Of Electric And Electronic Engineering Muroran Institute Of Technology

• Shirotani Ichimin

  Faculty Of Engineering Muroran Institute Of Technology

• Shirotani Ichimin

  Institute For Solid State Physics University Of Tokyo

• Shiozawa Hidetsugu

  Department Of Physics Tokyo Metropolitan University

• Sakurai Hiroya

  Superconducting Materials Center National Institute For Materials Science (smc/nims)

• Matsuda Tatsuma

  Advanced Science Research Center Japan Atomic Energy Agency

• Muramatsu Takaki

  Research Center For Materials Science Under Extreme Conditions Osaka University

• Nakano Toshihiro

  Department Of Quantum Matter Adsm Hiroshima University

• Sakai Hironori

  Advanced Science Research Center Japan Atomic Energy Agency

• Sakata H

  Department Of Physics Tokyo Institute Of Technology

• Taniguchi M

  Division Of Material Chemistry Faculty Of Engineering Kyoto University

• Sato Hideyuki

  Graduate School Of Science Tokyo Metropolitan University

• Sato Hideyuki

  Department Of Cardiology Osaka University Graduate School Of Medicine

• Nishigaki Tsuguhito

  Faculty Of Science Tokyo Metropolitan University

• Nakama T

  Advanced Technol. Inst. Inc. Tokyo Jpn

• Sato Hideyuki

  Department Of Applied Chemistry Faculty Of Science And Technology Keio University

• Sugawara Hitoshi

  Tokushima Univ. Tokushima

• Aoki Yuji

  Graduate School Of Science Tokyo Metropolitan University

• Sekine C

  Department Of Electric And Electronic Engineering Muroran Institute Of Technology

• Shishido Hiroaki

  Kyoto Univ. Kyoto

• MATSUDA Tatsuma

  Advance Science Research Center, Japan Atomic Energy Agency

• HAGA Yoshinori

  Advance Science Research Center, Japan Atomic Energy Agency

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