Heavy fermions in YbAl3 studied by the de Haas-van Alphen effect

Takao Ebihara, Yoshihiko Inada, Masao Murakawa, Shinya Uji, Chieko Terakura, Taichi Terashima, Etsuji Yamamoto, Yoshinori Haga, Yoshichika Onuki, Hisatomo Harima

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56 Citations (Scopus)


We carried out the de Haas-van Alphen (dHvA) experiment in YbAl3 with the cubic crystal structure. One of the six dHvA branches, named β with a dHvA frequency of 4.5×107 Oe, is nearly spherical in topology and has a large cyclotron mass of 23.9 m0. The other branches were observed only in small angular regions centered at symmetrical directions. Their cyclotron masses are in the range from 13.5 to 17.4 m0. The topology of the Fermi surface cannot be explained by the conventional band model because the fully occupied 4f-levels in YbAl3 are below the Fermi level. A small alteration so as to shift upwards the 4f-levels is necessary to fit to the experimental dHvA data. These give a direct evidence that the 4f-electrons form heavy fermions at low temperatures, which is most likely related to the many-body Kondo effect.

Original languageEnglish
Pages (from-to)895-899
Number of pages5
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - Mar 2000
Externally publishedYes


  • Energy band structure
  • Fermi surface
  • YbAl
  • dHvA

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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