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- W1680202868 abstract "The filled skutterudite compound SmRu_4P_{12} undergoes a complex evolution from a paramagnetic metal (phase I) to a probable multipolar ordering insulator (phase II) at T_{MI} = 16.5 K, then to a magnetically ordered phase (phase III) at T_{N} = 14 K. Elastic properties under hydrostatic pressures were investigated to study the nature of the ordering phases. We found that distinct elastic softening above T_{MI} is induced by pressure, giving evidence of quadrupole degeneracy of the ground state in the crystalline electric field. It also suggests that quadrupole moment may be one of the order parameters below T_{MI} under pressure. Strangely, the largest degree of softening is found in the transverse elastic constant C_{T} at around 0.5-0.6 GPa, presumably having relevancy to the competing and very different Gruneisen parameters Omega of T_{MI} and T_{N}. Interplay between the two phase transitions is also verified by the rapid increase of T_{MI} under pressure with a considerably large Omega of 9. Our results can be understood on the basis of the proposed octupole scenario for SmRu_4P_{12}." @default.
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- W1680202868 date "2007-02-23" @default.
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- W1680202868 title "Anomalous elastic softening of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Sm</mml:mi><mml:msub><mml:mi mathvariant=normal>Ru</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>P</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math>under high pressure" @default.
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- W1680202868 doi "https://doi.org/10.1103/physrevb.75.054114" @default.
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