A change of the Fermi surface in UGe2 across the critical pressure

R. Settai, M. Nakashima, S. Araki, Y. Haga, T. C. Kobayashi, N. Tateiwa, H. Yamagami, Y. Onuki

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22 Citations (Scopus)


We carried out the de Haas-van Alphen (dHvA) experiment under pressure for a ferromagnet UGe2. The dHvA frequency of a main dHvA branch named α, that corresponds to a majority up-spin band 40-hole Fermi surface, decreases monotonously with increasing pressure, but in the pressure range from P*c (≃1.2 GPa) to pc (≃1.5 GPa) the dHvA signal disappears completely, where pc and p*c correspond to critical pressures for a Curie temperature TC and the second phase transition temperature T* (<TC), respectively. For p > pc we observed new dHvA branches with large cyclotron masses of 19-64m0, which correspond to main Fermi surfaces in the paramagnetic state.

Original languageEnglish
Pages (from-to)L29-L36
JournalJournal of Physics Condensed Matter
Issue number1
Publication statusPublished - Jan 14 2002
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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