Magnetic order induced crystal symmetry lowering in ACr$_2$O$_4$ ferrimagnetic spinels

Details Magnetic order induced crystal symmetry lowering in ACr$_2$O$_4$ ferrimagnetic spinels Magnetic order induced crystal symmetry lowering in ACr$_2$O$_4$ ferrimagnetic spinels

2009-04-23

arxiv.org/abs/0904.3712v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures. submitted to Phys. Rev. Lett

Scientific paper

We demonstrate that the onset of complex spin orders in ACr$_2$O$_4$ spinels with magnetic A$=$Co, Fe and Cu ions lowers the lattice symmetry. This is clearly indicated by the emergence of anisotropic lattice dynamics -- as evidenced by the pronounced phonon splittings -- even when experiments probing static distortions fail. We show that the crystal symmetry in the magnetic phase is reduced from tetragonal to orthorhombic for FeCr$_2$O$_4$ and CuCr$_2$O$_4$ with Jahn-Teller active A-site ions. The conical spin structure in FeCr$_2$O$_4$ is also manifested in the phonon frequencies. In contrast, the multiferroic CoCr$_2$O$_4$ with no orbital degrees of freedom remains nearly cubic in its ground state.

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