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High magnetic field phase diagram of PrOs4Sb12

C. R. Rotundu·H. Tsujii·Y. Takano·B. Andraka·H. Sugawara·Y. Aoki·H. Sato
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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 $Γ_1$ singlet being the CEF ground state and suggest the level crossing (involving lowest CEF levels) as the driving mechanism of FIOP.

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C. R. Rotundu, H. Tsujii, Y. Takano, B. Andraka, H. Sugawara, Y. Aoki, H. Sato. 2003-09-02. High magnetic field phase diagram of PrOs4Sb12. https://doi.org/10.1103/physrevlett.92.037203

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