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Direct observation of lattice symmetry breaking at the hidden-order transition in URu$$_2$$Si$$_2$$

URu$$_2$$Si$$_2$$の隠れた秩序における結晶格子対称性の破れを直接観測

利根川 翔*; 笠原 成*; 福田 竜生; 杉本 邦久*; 安田 伸広*; 鶴原 悠悟*; 渡邊 大樹*; 水上 雄太*; 芳賀 芳範; 松田 達磨*; 山本 悦嗣; 大貫 惇睦; 池田 浩章*; 松田 祐司*; 芝内 孝禎*

Tonegawa, Sho*; Kasahara, Shigeru*; Fukuda, Tatsuo; Sugimoto, Kunihisa*; Yasuda, Nobuhiro*; Tsuruhara, Yugo*; Watanabe, Daiki*; Mizukami, Yuta*; Haga, Yoshinori; Matsuda, Tatsuma*; Yamamoto, Etsuji; Onuki, Yoshichika; Ikeda, Hiroaki*; Matsuda, Yuji*; Shibauchi, Takasada*

We report on the observation of lattice symmetry breaking from the fourfold to twofold structure by high-resolution synchrotron X-ray diffraction measurements at zero field. Small orthorhombic symmetry-breaking distortion sets in at the transition temperature with a jump, uncovering the weakly first-order nature of the hidden-order transition. This distortion is observed only in ultra pure samples, implying a highly unusual coupling nature between the electronic pneumaticity and underlying lattice.

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パーセンタイル:7.69

分野:Multidisciplinary Sciences

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