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Magnetism and superconductivity in CePt$$_3$$Si probed by muon spin relaxation

$$mu$$SRにより調べたCePt$$_3$$Siの磁性と超伝導

髭本 亘  ; 芳賀 芳範  ; 松田 達磨; 大貫 惇睦; 幸田 章宏*; Saha, S. R.*; 大石 一城; 門野 良典*

Higemoto, Wataru; Haga, Yoshinori; Matsuda, Tatsuma; Onuki, Yoshichika; Koda, Akihiro*; Saha, S. R.*; Oishi, Kazuki; Kadono, Ryosuke*

ミュオンスピン回転,緩和法を用いて調べた多結晶CePt$$_3$$Siの磁性,磁場侵入長及びナイトシフト測定の結果について報告する。ゼロ磁場中では試料の全体積において磁性が観測された。また17kOeにおいて20mKまでの範囲で測定したミュオンナイトシフトでは3つの異なるナイトシフトが観測された。この結果に基づいた超伝導電子対の対称性についての議論を行う。

We report on the Magnetism, magnetic penetration depth and the Knight shift in polycrystalline sample of CePt$$_3$$Si by means of muon spin rotation and relaxation method. The appearance of the internal field under the zero magnetic field in whole volume of the specimen, was observed, which indicating clear evidence of antiferromagnetism. The muon Knight shift was measured down to 20mK at 17kOe. Three different frequencies are seen in the muon spin rotation spectra, which depend on the temperature. The symmetry of the superconducting Cooper pair will be discussed.

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