Magnetically Hidden Order of Kramers Doublets in d1 Systems: Sr2VO4
Abstract
We formulate and study an effective Hamiltonian for low-energy Kramers doublets of d1-ions on a square lattice. We find that the system exhibits a magnetically hidden order in which the expectation values of the local spin and orbital moments both vanish. The order parameter responsible for a time-reversal symmetry breaking has a composite nature and is a spin-orbital analog of a magnetic octupole. We argue that such a hidden order is realized in the layered perovskite Sr2VO4.
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