Two kinds of cylindrical Fermi surface determined by de Haas-van Alphen experiments in NpCoGa5

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

doi:10.1143/JPSJ.73.2608

Two kinds of cylindrical Fermi surface determined by de Haas-van Alphen experiments in NpCoGa₅

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

Materials Processing and Characterization Division

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

Abstract

We succeeded in observing de Haas-van Alphen (dHvA) oscillations in an antiferromagnet NpCoGa₅ with a tetragonal structure. The dHvA signal was significantly enhanced at higher fields than the metamagnetic transition field H_m (= 43 kOe for H ∥ [001]), where the antiferromagnetic state is changed into the field-induced ferromagnetic (paramagnetic) state. In the paramagnetic state, the Fermi surface was found to consist of two kinds of cylindrical main Fermi surface and small pocket Fermi surfaces. The cyclotron masses of the main Fermi surfaces were considerably large, ranging from 6 to 12 m₀. This is the first case where the Fermi surface was determined experimentally in transuranium compounds.

Original language	English
Pages (from-to)	2608-2611
Number of pages	4
Journal	journal of the physical society of japan
Volume	73
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.73.2608
Publication status	Published - 2004 Oct 1

Keywords

De Haas-van Alphen effect
Fermi surface
NpCoGa
Transuranium compound

ASJC Scopus subject areas

Physics and Astronomy(all)

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Two kinds of cylindrical Fermi surface determined by de Haas-van Alphen experiments in NpCoGa₅. / Aoki, Dai ; Homma, Yoshiya; Shiokawa, Yoshinobu; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio; Onuki, Yoshichika.

In: journal of the physical society of japan, Vol. 73, No. 10, 01.10.2004, p. 2608-2611.

Research output: Contribution to journal › Article › peer-review

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abstract = "We succeeded in observing de Haas-van Alphen (dHvA) oscillations in an antiferromagnet NpCoGa5 with a tetragonal structure. The dHvA signal was significantly enhanced at higher fields than the metamagnetic transition field Hm (= 43 kOe for H ∥ [001]), where the antiferromagnetic state is changed into the field-induced ferromagnetic (paramagnetic) state. In the paramagnetic state, the Fermi surface was found to consist of two kinds of cylindrical main Fermi surface and small pocket Fermi surfaces. The cyclotron masses of the main Fermi surfaces were considerably large, ranging from 6 to 12 m0. This is the first case where the Fermi surface was determined experimentally in transuranium compounds.",

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AU - Aoki, Dai

AU - Homma, Yoshiya

AU - Shiokawa, Yoshinobu

AU - Yamamoto, Etsuji

AU - Nakamura, Akio

AU - Haga, Yoshinori

AU - Settai, Rikio

AU - Onuki, Yoshichika

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N2 - We succeeded in observing de Haas-van Alphen (dHvA) oscillations in an antiferromagnet NpCoGa5 with a tetragonal structure. The dHvA signal was significantly enhanced at higher fields than the metamagnetic transition field Hm (= 43 kOe for H ∥ [001]), where the antiferromagnetic state is changed into the field-induced ferromagnetic (paramagnetic) state. In the paramagnetic state, the Fermi surface was found to consist of two kinds of cylindrical main Fermi surface and small pocket Fermi surfaces. The cyclotron masses of the main Fermi surfaces were considerably large, ranging from 6 to 12 m0. This is the first case where the Fermi surface was determined experimentally in transuranium compounds.

AB - We succeeded in observing de Haas-van Alphen (dHvA) oscillations in an antiferromagnet NpCoGa5 with a tetragonal structure. The dHvA signal was significantly enhanced at higher fields than the metamagnetic transition field Hm (= 43 kOe for H ∥ [001]), where the antiferromagnetic state is changed into the field-induced ferromagnetic (paramagnetic) state. In the paramagnetic state, the Fermi surface was found to consist of two kinds of cylindrical main Fermi surface and small pocket Fermi surfaces. The cyclotron masses of the main Fermi surfaces were considerably large, ranging from 6 to 12 m0. This is the first case where the Fermi surface was determined experimentally in transuranium compounds.

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