We report measurements of the magnetic field dependence of the low temperature specific heat of single crystal samples of the heavy-fermion superconductor PrOs4Sb12. The specific heat anomaly at Tc resides on a large Schottky anomaly and exhibits a double peak structure similar to the behaviour observed in UPt3. For B$>$2 T, the Schottky anomaly becomes increasingly suppressed. At low T, a maximum develops for B$>$4.5 T which sharpens considerably and shifts to higher T with increasing B corresponding to a feature in the electrical resistivity. This suggests a field tuned T = 0 phase transition to a high field phase just above the suppression of superconductivity.     «

We report measurements of the magnetic field dependence of the low temperature specific heat of single crystal samples of the heavy-fermion superconductor PrOs4Sb12. The specific heat anomaly at Tc resides on a large Schottky anomaly and exhibits a double peak structure similar to the behaviour observed in UPt3. For B$>$2 T, the Schottky anomaly becomes increasingly suppressed. At low T, a maximum develops for B$>$4.5 T which sharpens considerably and shifts to higher T with increasing B corresp...     »