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Thermodynamical Study on the Heavy-Fermion Superconductor PrOs<sub>4</sub>Sb<sub>12</sub>: Evidence for Field-Induced Phase Transition
We report measurements of low-temperature specific heat on the 4f^2-based heavy-fermion superconductor PrOs4Sb12. In magnetic fields above 4.5 T in the normal state, distinct anomalies are found which demonstrate the existence of a field-induced ordered phase (FIOP). The Pr nuclear specific heat indicates an enhancement of the 4f magnetic moment …