First Observation of the de Haas–van Alphen Effect in NpNiGa5

Dai Aoki; Etsuji Yamamoto; Yoshiya Homma; Yoshinobu Shiokawa; Akio Nakamura; Yoshinori Haga; Rikio Settai; Yoshichika Onuki

doi:10.1143/jpsj.73.519

First Observation of the de Haas–van Alphen Effect in NpNiGa₅

Dai Aoki, Etsuji Yamamoto, Yoshiya Homma, Yoshinobu Shiokawa, Akio Nakamura, Yoshinori Haga, Rikio Settai, Yoshichika Onuki

Author information

Dai Aoki
Institute for Materials Research, Tohoku University
Etsuji Yamamoto
Advanced Science Research Center, Japan Atomic Energy Research Institute
Yoshiya Homma
Institute for Materials Research, Tohoku University
Yoshinobu Shiokawa
Institute for Materials Research, Tohoku University
Advanced Science Research Center, Japan Atomic Energy Research Institute
Akio Nakamura
Advanced Science Research Center, Japan Atomic Energy Research Institute
Yoshinori Haga
Advanced Science Research Center, Japan Atomic Energy Research Institute
Rikio Settai
Graduate School of Science, Osaka University
Yoshichika Onuki
Advanced Science Research Center, Japan Atomic Energy Research Institute
Graduate School of Science, Osaka University

Keywords: NpNiGa₅, de Haas–van Alphen effect, transuranium compound

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2004 Volume 73 Issue 3 Pages 519-522

DOI https://doi.org/10.1143/jpsj.73.519

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Abstract

We succeeded in observing the de Haas–van Alphen (dHvA) oscillations in NpNiGa₅ single crystals, which were grown by the Ga-flux method. This is the first dHvA observation in transuranium compounds. The cyclotron effective masses were moderately enhanced, ranging from 1.8 to 4.9m₀ (m₀: rest mass of an electron). From an intensive change of the dHvA amplitude at 80–90 kOe and the temperature dependence of the electrical resistivity, NpNiGa₅ is most likely an antiferromagnet with a Néel temperature, T_N=30 K.

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