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Hybridization-Driven Orthorhombic Lattice Instability in URu2Si2

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arxiv 1311.3748 v1 pith:IKALVCY3 submitted 2013-11-15 cond-mat.str-el

Hybridization-Driven Orthorhombic Lattice Instability in URu2Si2

T. Yanagisawa , S. Mombetsu , H. Hidaka , H. Amitsuka , M. Akatsu , S. Yasin , S. Zherlitsyn , J. Wosnitza
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K. Huang M. Janoschek M. B. Maple
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classification cond-mat.str-el
keywords c11-c12instabilityuru2si2appearselectronsepsilonfieldhidden-order
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We have measured the elastic constant (C11-C12)/2 in URu2Si2 by means of high-frequency ultrasonic measurements in pulsed magnetic fields H || [001] up to 61.8 T in a wide temperature range from 1.5 to 116 K. We found a reduction of (C11-C12)/2 that appears only in the temperature and magnetic field region in which URu2Si2 exhibits a heavy-electron state and hidden-order. This change in (C11-C12)/2 appears to be a response of the 5f-electrons to an orthorhombic and volume conservative strain field \epsilon_xx-\epsilon_yy with {\Gamma}3-symmetry. This lattice instability is likely related to a symmetry-breaking band instability that arises due to the hybridization of the localized f electrons with the conduction electrons, and is probably linked to the hidden-order parameter of this compound.

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