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

研究成果: Article査読

52 被引用数 (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.

ジャーナルPhysical review letters
出版ステータスPublished - 2012 7月 16

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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