TY - JOUR
T1 - Linear and nonlinear optical probe of the ferroelectric-like phase transition in a polar metal, LiOsO3
AU - Padmanabhan, Haricharan
AU - Park, Yoonsang
AU - Puggioni, Danilo
AU - Yuan, Yakun
AU - Cao, Yanwei
AU - Gasparov, Lev
AU - Shi, Youguo
AU - Chakhalian, Jak
AU - Rondinelli, James M.
AU - Gopalan, Venkatraman
N1 - Funding Information:
H.P., Y.Y., V.G., Y.C., and J.C. acknowledge DOE Grant No. DE-SC0012375 for SHG microscopy, sample preparation, and bond anisotropy analysis. H.P., Y.P., and V.G. acknowledge NSF MRSEC CNS Grant No. DMR-1420620 for ellipsometry and Raman studies. D.P. and J.M.R. were supported by ARO (W911NF-15-1-0017). J.C. was supported by the Gordon and Betty Moore Foundation EPiQS Initiative through Grant No. GBMF4534. Y.S. acknowledges the National Natural Science Foundation of China Grant Nos. 11774399 and 11474330 and the Chinese Academy of Sciences Grant Nos. XDB07020100 and QYZDB-SSW-SLH043 and also Kazunari Yamaura in National Institute for Materials Science (NIMS) of Japan for providing high quality LiOsO3 single crystals. L.G. acknowledges NSF Grant Nos. DMR-0805073, DMR-0958349, and DMR-1429428, Office of Naval Research Award No. N00014-06-1-013, and UNF Terry Presidential Professorship.
Publisher Copyright:
© 2018 Author(s).
PY - 2018/9/17
Y1 - 2018/9/17
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85053823472&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053823472&partnerID=8YFLogxK
U2 - 10.1063/1.5042769
DO - 10.1063/1.5042769
M3 - Article
AN - SCOPUS:85053823472
SN - 0003-6951
VL - 113
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 12
M1 - 122906
ER -