Subtle structural distortions in LiOsO3 observed using optical second harmonic generation
Abstract
LiOsO3 is a metal that undergoes a non-polar to polar structural phase transition upon cooling below a critical temperature Tc 140 K, which is unusual because the presence of itinerant carriers is usually incompatible with ferroelectric-like structural distortions. To explore the microscopic mechanism of this phase transition, we performed angle-of-incidence dependent optical second harmonic rotational anisotropy measurements on LiOsO3 single crystals. We observe subtle distortions in the paraelectric phase above Tc and I will discuss their implications for an order-disorder versus a displacive picture of the polar phase transition.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARE02011S