High magnetic field phase diagram of PrOs4Sb12

Abstract

The magnetic phase diagram of PrOs${}_4$Sb${}_{12}$ has been investigated by specific heat measurements between 8 and 32 T. A new Schottky anomaly due to excitations between two lowest crystalline-electric-field (CEF) singlets, has been found for both $H\parallel (100)$ and $H\parallel (110)$ above the field where the field-induced ordered phase (FIOP) is suppressed. The constructed $H-T$ phase diagram shows weak magnetic anisotropy and implies a crossing of the two CEF levels at about 8 - 9 T for both field directions. These results provide an unambiguous evidence for the ${\Gamma }_1$ singlet being the CEF ground state and suggest the level crossing (involving lowest CEF levels) as the driving mechanism of FIOP.

arXiv commentSubmitted to Phys. Rev. Lett

References in corpus (5)

• Thermodynamical Study on the Heavy-Fermion Superconductor PrOs4Sb12: Evidence for Field-Induced Phase Transition
• Low temperature specific heat of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Fermi surface of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Field Dependence of Electronic Specific Heat in Two-Band Superconductors
• Crystalline electric field effects in the electrical resistivity of PrOs${}_4$Sb${}_{12}$

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