Magnetically Hidden Order of Kramers Doublets in $d^1$ Systems: Sr$_2$VO$_4$

Details Magnetically Hidden Order of Kramers Doublets in $d^1$ Systems: Sr$_2$VO$_4$ Magnetically Hidden Order of Kramers Doublets in $d^1$ Systems: Sr$_2$VO$_4$

2009-06-15

arxiv.org/abs/0906.2733v2

Phys. Rev. Lett. 103, 067205 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures; minor changes

Scientific paper

10.1103/PhysRevLett.103.067205

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$_4$.

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