Quadrupolar effect and rattling motion in heavy fermion superconductor PrOs_4Sb_{12}

Details Quadrupolar effect and rattling motion in heavy fermion superconductor PrOs_4Sb_{12} Quadrupolar effect and rattling motion in heavy fermion superconductor PrOs_4Sb_{12}

2004-04-08

arxiv.org/abs/cond-mat/0404195v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.180511

The elastic properties of a filled skutterudite PrOs_4Sb_{12} with a heavy Fermion superconductivity at T_C=1.85 K have been investigated. The elastic softening of (C_{11}-C_{12})/2 and C_{44} with lowering temperature down to T_C indicates that the quadrupolar fluctuation due to the CEF state plays a role for the Cooper paring in superconducting phase of PrOs_4Sb_{12}. A Debye-type dispersion in the elastic constants around 30 K revealed a thermally activated Gamma_{23} rattling due to the off-center Pr-atom motion obeying tau=tau_{0}exp(E/k_{B}T) with an attempt time tau_0=8.8*10^{-11} sec and an activation energy E=168 K. It is remarkable that the charge fluctuation of the off-center motion with Gamma_{23} symmetry may mix with the quadrupolar fluctuation and enhance the elastic softening of (C_{11}-C_{12})/2 just above T_C.

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