Direct observation of lattice symmetry breaking at the hidden-order transition in URu 2 Si 2

S. Tonegawa, S. Kasahara, T. Fukuda, K. Sugimoto, N. Yasuda, Y. Tsuruhara, D. Watanabe, Y. Mizukami, Y. Haga, T. D. Matsuda, E. Yamamoto, Y. Onuki, H. Ikeda, Y. Matsuda, T. Shibauchi

研究成果: ジャーナルへの寄稿学術論文査読

53 被引用数 (Scopus)

抄録

Since the 1985 discovery of the phase transition at T HO =17.5 K in the heavy-fermion metal URu 2 Si 2, neither symmetry change in the crystal structure nor large magnetic moment that can account for the entropy change has been observed, which makes this hidden order enigmatic. Recent high-field experiments have suggested electronic nematicity that breaks fourfold rotational symmetry, but direct evidence has been lacking for its ground state in the absence of magnetic field. Here we report on the observation of lattice symmetry breaking from the fourfold tetragonal to twofold orthorhombic structure by high-resolution synchrotron X-ray diffraction measurements at zero field, which pins down the space symmetry of the order. Small orthorhombic symmetry-breaking distortion sets in at T HO with a jump, uncovering the weakly first-order nature of the hidden-order transition. This distortion is observed only in ultrapure samples, implying a highly unusual coupling nature between the electronic nematicity and underlying lattice.

本文言語英語
論文番号4188
ジャーナルNature Communications
5
DOI
出版ステータス出版済み - 2014 6月 19

フィンガープリント

「Direct observation of lattice symmetry breaking at the hidden-order transition in URu 2 Si 2」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル