Spin-orbital frustration in Mott insulators
27.04.2017
| Date | 27.04.2017 |
|---|---|
| Time | 16:45-18:00 |
| Place |
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| Speaker | George Jackeli |
| Area of expertise | Physics |
| Host | Dep. Physik |
| Contact | Zheludev |
| Abstract | In Mott insulators, unquenched orbital degrees of freedom often frustrate the magnetic interactions and lead to a plethora of interesting phases with unusual spin patterns or non-magnetic states without long-range order. I will review from this perspective the theoretical concepts and experimental data on late transition metal compounds, mostly focusing on iridates. In the second part, I will present our recent theoretical study of interplay of spin and orbital degrees in double-perovskite compounds with spin one-half ions occupying the frustrated fcc sublattice, such as molybdenum and osmium oxides. I will argue that this interplay might lead to a rich variety of the phases that include non-collinear ordered patterns with or without net moment, and, most remarkably, non-magnetic disordered spin-orbit dimer state. |