Effect of Antiferro-Quadrupole Fluctuations on Thermodynamic Quantities in PrOs<SUB>4</SUB>Sb<SUB>12</SUB>

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  • Effect of antiferro-quadrupole fluctuations on thermodynamic quantities in PrOs4Sb12

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Field-oriented anisotropy of specific heat and magnetization in PrOs4Sb12 is discussed on the basis of the generalized Holstein–Primakoff formalism under magnetic fields. With a moderate amount of the mixing parameter characterizing Th symmetry, we obtain distinct anisotropy of the specific heat due to fluctuations for H||[100] and H||[110] both in the para and the antiferro-quadrupole phases. Tendency of the anisotropy in the specific heat is consistent with the experimental results, while the calculated anisotropy of the magnetization in the para phase is opposite to that observed in the experiment. Although the magnetic field usually suppresses fluctuations due to level splitting, the presence of the critical soft modes in the exciton dispersion contributes significantly to thermodynamic quantities in antiferro-quadrupole systems.

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