Quadrupolar effect and rattling motion in the heavy-fermion superconductor PrOs4Sb12
Terutaka Goto, Yuichi Nemoto, Kazuhiro Sakai, Takashi Yamaguchi, Mitsuhiro Akatsu, Tatsuya Yanagisawa, Hirofumi Hazama, Kei Onuki, Hitoshi Sugawara, Hideyuki Sato
DOI 10.1103/PhysRevB.69.180511 · Physical Review B
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Abstract
The elastic properties of a filled skutterudite PrOs4Sb12 with a heavy fermion superconductivity at TC=1.85K have been investigated. The elastic softening of (C11−C12)/2 and C44 with lowering temperature down to TC indicates that the quadrupolar fluctuation due to the CEF state plays a role for the Cooper paring in superconducting phase of PrOs4Sb12. A Debye-type dispersion in the elastic constants around 30 K revealed a thermally activated Γ23 rattling due to the off-center Pr-atom motion obeying τ=τ0exp(E/kBT) with an attempt time τ0=8.8×10−11s and an activation energy E=168K. It is remarkable that the charge fluctuation of the off-center motion with Γ23 symmetry may mix with the quadrupolar fluctuation and enhance the elastic softening of (C11−C12)/2 just above TC.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.85 | Pressure not reported | unknown |
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