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Magnetization study in the heavy fermion superconductor NpPd$$_5$$Al$$_2$$

重い電子系超伝導体NpPd$$_5$$Al$$_2$$の磁気特性

芳賀 芳範   ; 吉尾 俊亮*; 本間 佳哉*; 青木 大*; 松田 達磨; 立岩 尚之   ; 菅井 孝志*; 山本 悦嗣  ; 中村 彰夫; 大貫 惇睦

Haga, Yoshinori; Yoshio, Shunsuke*; Homma, Yoshiya*; Aoki, Dai*; Matsuda, Tatsuma; Tateiwa, Naoyuki; Sugai, Takashi*; Yamamoto, Etsuji; Nakamura, Akio; Onuki, Yoshichika

We present the magnetization study of NpPd$$_5$$Al$$_2$$ in the low-temperature and high-field region. A capacitance Faraday magnetometer was developed for the transuranium compound where the radioactive sample is encapsulated. Magnetization curves can be measured for a tiny single crystal with the mass typically less than 1 mg. We succeeded to observe a clear magnetization process in the superconducting state showing a large hysteresis loop and a clear anomaly at $$H_{rm c2}$$.

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