open access

https://hdl.handle.net/2115/53631

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

英語

2013-11-26

American Physical Society

Physical Review B

88(19)

195150-1-195150-5

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.

学術雑誌論文

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©2013 American Physical Society

1098-0121

1550-235X