Optical study of MgTi$_2$O$_4$: Evidence for an orbital-Peierls state

Details Optical study of MgTi$_2$O$_4$: Evidence for an orbital-Peierls state Optical study of MgTi$_2$O$_4$: Evidence for an orbital-Peierls state

2006-07-31

arxiv.org/abs/cond-mat/0607813v2

Phys. Rev. B 74, 245102 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.74.245102

Dimension reduction due to the orbital ordering has recently been proposed to explain the exotic charge, magnetic and structural transitions in some three-dimensional (3D) transitional metal oxides. We present optical measurement on a spinel compound MgTi$_2$O$_4$ which undergoes a sharp metal-insulator transition at 240 K, and show that the spectral change across the transition can be well understood from the proposed picture of 1D Peierls transition driven by the ordering of $d_{yz}$ and $d_{zx}$ orbitals. We further elaborate that the orbital-driven instability picture applies also very well to the optical data of another spinel CuIr$_2$S$_4$ reported earlier.

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