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Title: Linear and nonlinear optical probe of the ferroelectric-like phase transition in a polar metal, LiOsO3

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5042769· OSTI ID:1540244

LiOsO3 is one of the first materials identified in the current 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). Robust 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.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0012375
OSTI ID:
1540244
Alternate ID(s):
OSTI ID: 1471766
Journal Information:
Applied Physics Letters, Vol. 113, Issue 12; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (3)

Fast reflective optic-based rotational anisotropy nonlinear harmonic generation spectrometer journal May 2019
Raman interrogation of the ferroelectric phase transition in polar metal LiOsO 3 journal September 2019
Effect of strain and doping on the polar metal phase in LiOsO$_3$ text January 2019

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