Cyclotron resonance in the hidden-order phase of URu 2Si 2

S. Tonegawa, K. Hashimoto, K. Ikada, Y. H. Lin, H. Shishido, Y. Haga, T. D. Matsuda, E. Yamamoto, Y. Onuki, H. Ikeda, Y. Matsuda, T. Shibauchi

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52 Citations (Scopus)


We report the first observation of cyclotron resonance in the hidden-order phase of ultraclean URu 2Si 2 crystals, which allows the full determination of angle-dependent electron-mass structure of the main Fermi-surface sheets. We find an anomalous splitting of the sharpest resonance line under in-plane magnetic-field rotation. This is most naturally explained by the domain formation, which breaks the fourfold rotational symmetry of the underlying tetragonal lattice. The results reveal the emergence of an in-plane mass anisotropy with hot spots along the [110] direction, which can account for the anisotropic in-plane magnetic susceptibility reported recently. This is consistent with the "nematic" Fermi liquid state, in which itinerant electrons have unidirectional correlations.

Original languageEnglish
Article number036401
JournalPhysical review letters
Issue number3
Publication statusPublished - 2012 Jul 16

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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