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 a 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 isostructural insulator LiNbO3, except the component along the polar axis d33, which 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 techniques reveal 109 deg/71 deg ferroelastic domain walls, like in other trigonal ferroelectrics. No 180 deg polar domain walls are observed to emerge across the phase transition.

arXiv commentSupplementary material in ancillary files

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Cited by in corpus (13)

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• Comprehensive Anisotropic Linear Optical Properties of Weyl Semimetals, TaAs and NbAs
• Coexistence of polar displacements and conduction in doped ferroelectrics: an ab initio comparative study
• Effect of strain and doping on the polar metal phase in LiOsO${}_3$
• Evidence for an extended critical fluctuation region above the polar ordering transition in LiOsO${}_3$
• Fast Reflective Optic-Based Rotational Anisotropy Nonlinear Harmonic Generation Spectrometer
• Strong nonlinear optical response and transient symmetry switching in Type-II Weyl semimetal $\beta$-WP2
• Metallic ferroelectric-ferromagnetic multiferroics in strained EuTiO${}_{3-x}$H${}_x$
• A versatile setup for symmetry-resolved ultrafast dynamics of quantum materials