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We have made ultrasonic measurements on a filled skutterudite PrOs 4 Sb 12 showing a heavy Fermion superconductivity at TC=1.85K. The elastic constants (C11-C12)/2 and C44 of PrOs 4 Sb 12 exhibit low-temperature softenings below 20K down to TC, indicating a quadrupole fluctuation of Pr3+ ion. A minimum of (C11-C12)/2 in magnetic fields along the [110] direction around...
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