Cyclotron Resonance in the Hidden-Order Phase of URu_{2}Si_{2} |
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Authors: | 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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Institution: | Department of Physics, Kyoto University, Kyoto 606-8502, Japan. |
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Abstract: | We report the first observation of cyclotron resonance in the hidden-order phase of ultraclean URu_{2}Si_{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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