Magnetically hidden order of Kramers doublets in d;{1} systems: Sr2VO4.
We formulate and study an effective Hamiltonian for low-energy Kramers doublets of d;{1} 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 Sr_{2}VO_{4}.
Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany.
George
G
Jackeli
Giniyat
G
Khaliullin