TY - JOUR
T1 - Cyclotron resonance in the hidden-order phase of URu 2Si 2
AU - Tonegawa, S.
AU - Hashimoto, K.
AU - Ikada, K.
AU - Lin, Y. H.
AU - Shishido, H.
AU - Haga, Y.
AU - Matsuda, T. D.
AU - Yamamoto, E.
AU - Onuki, Y.
AU - Ikeda, H.
AU - Matsuda, Y.
AU - Shibauchi, T.
PY - 2012/7/16
Y1 - 2012/7/16
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.109.036401
DO - 10.1103/PhysRevLett.109.036401
M3 - Article
AN - SCOPUS:84863964596
VL - 109
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 3
M1 - 036401
ER -