Linear and nonlinear optical probe of the ferroelectric-like phase transition in a polar metal, LiOsO3
Abstract
LiOsO3 is one of the first materials identified in the recent literature as a “polar metal,” a class of materials that are simultaneously noncentrosymmetric and metallic. In this work, the linear and nonlinear optical susceptibility of LiOsO3 is studied by means of ellipsometry and optical second harmonic generation (SHG). Strong optical birefringence is observed using spectroscopic ellipsometry. The nonlinear optical susceptibility extracted from SHG polarimetry reveals that the tensor components are of the same magnitude as in the isostructural insulator LiNbO3, except the component along the polar axis d33 is suppressed by an order of magnitude. Temperature-dependent SHG measurements in combination with Raman spectroscopy indicate a continuous order-disorder type polar phase transition at 140 K. Linear and nonlinear optical microscopy measurements reveal 109°/71° ferroelastic domain walls, like in other trigonal ferroelectrics. No 180° polar domain walls are observed to emerge across the phase transition.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 17, 2018
- Source ID
- 10.1063/1.5042769
Entities
People
- Danilo Puggioni
- Haricharan Padmanabhan
- Jak Chakhalian
- James M. Rondinelli
- Lev V. Gasparov
- Venkatraman Gopalan
- Yakun Yuan
- Yanwei Cao
- Yoonsang Park
- Youguo Shi
Organizations
- Army Research Office
- Chinese Academy of Sciences
- Gordon and Betty Moore Foundation
- National Natural Science Foundation of China
- National Science Foundation
- Northwestern University
- Office of Naval Research
- Pennsylvania State University
- Rutgers University
- United States Department of Energy
- University of North Florida