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

Research output: Contribution to journalArticle

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 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.

Original languageEnglish
Pages (from-to)2608-2611
Number of pages4
Journaljournal of the physical society of japan
Volume73
Issue number10
DOIs
Publication statusPublished - 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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