Abstract
We propose a theory of the field-induced ordered state in PrOs 4 Sb 12 . It is based on an antiferro-quadrupolar (AFQ) interaction in the low-lying singlet–triplet subspace. Using a pseudo-spin description, we clarify a hidden symmetry in the local Hamiltonian and its relation with possible order parameters. Stable AFQ phases are determined for the direction of magnetic fields, and the effect of T h symmetry on the anisotropic phase diagram is discussed.
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