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# Hybridization-driven orthorhombic lattice instability in $URu_{2}Si_{2}$

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 Title: Hybridization-driven orthorhombic lattice instability in $URu_{2}Si_{2}$ Authors: Yanagisawa, T. Browse this author Mombetsu, S. Browse this author Hidaka, H. Browse this author Amitsuka, H. Browse this author Akatsu, M. Browse this author Yasin, S. Browse this author Zherlitsyn, S. Browse this author Wosnitza, J. Browse this author Huang, K. Browse this author Janoschek, M. Browse this author Maple, M. B. Browse this author Issue Date: 26-Nov-2013 Publisher: American Physical Society Journal Title: Physical Review B Volume: 88 Issue: 19 Start Page: 195150-1 End Page: 195150-5 Publisher DOI: 10.1103/PhysRevB.88.195150 Abstract: We have measured the elastic constant $(C_{11}-C_{12})/2$ in $UR_{u2}Si_2$ by means of high-frequency ultrasonic measurements in pulsed magnetic fields $H \parallel [001]$ up to 61.8 T in a wide temperature range from 1.5 to 116 K. We found a reduction of $(C_{11}-C_{12})/2$ that appears only in the temperature and magnetic field region in which $UR_{u2}Si_2$ exhibits a heavy-electron state and hidden-order. This change in $(C_{11}-C_{12})/2$ appears to be a response of the 5$\it{f}$-electrons to an orthorhombic and　volume conservative strain field $є_{xx}-є_{yy}$ with $Γ_3$ symmetry. This lattice instability is likely related　to a symmetry- breaking band instability that arises due to the hybridization of the localized $\it{f}$ electrons with the conduction electrons, and is probably linked to the hidden-order parameter of this compound. Rights: ©2013 American Physical Society Relation: http://publish.aps.org/authors/transfer-of-copyright-agreement Type: article URI: http://hdl.handle.net/2115/53631 Appears in Collections: 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)