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Si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*; et al.
Nature Communications (Internet), 5, p.4188_1 - 4188_7, 2014/06
被引用回数：52 パーセンタイル：89.07(Multidisciplinary Sciences)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.
Si田端 千紘*; 稲見 俊哉; 道村 真司*; 横山 淳*; 日高 宏之*; 柳澤 達也*; 網塚 浩*
Philosophical Magazine, 94(32-33), p.3691 - 3701, 2014/00
被引用回数：16 パーセンタイル：57.9(Materials Science, Multidisciplinary)We performed synchrotron X-ray diffraction measurements on a small single crystal of URuSi. A backscattering diffraction setup (2
) in combination with a Si(6 6 0) monochromator ensures a high instrumental resolution of 
, where 
denotes a lattice-plane spacing and 
is its spread expressed as the full width at half maximum (FWHM). We carefully measured the (5 5 0) Bragg peak in the temperature range between 5 and 25 K, and found it to show no signature of broadening and splitting when "Hidden Order (HO)" sets in below 17.5 K. Temperature variation of the peak position closely follows the behaviour of the known linear thermal expansion coefficient. Detailed analysis of the peak width reveals that the tetragonal fourfold rotational symmetry of URuSi is conserved in HO within the experimental accuracy of the orthorhombicity of 
.
Si徳永 陽
no journal, ,
ウラン化合物の超伝導転移温度はたかだか1-2K程度である。それでも多くの研究者の興味を惹きつけてやまないのは、どれもが一筋縄では行かないユニークな性質を持つためである。本講演ではその中で特に強磁性秩序(URhGe, UCoGe, UGe)や隠れた秩序(URuSi)という、電子系の長距離秩序とミクロに共存する超伝導を取り上げ、その特異な超伝導状態について紹介する。
