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Journal Article

Extreme Ultraviolet Second Harmonic Generation Spectroscopy in a Polar Metal


Zürch,  Michael
Department of Chemistry, University of California, Berkeley;
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Berger, E., Jamnuch, S., Uzundal, C. B., Woodahl, C., Padmanabhan, H., Amado, A., et al. (2021). Extreme Ultraviolet Second Harmonic Generation Spectroscopy in a Polar Metal. Nano Letters, 21(14), 6095-6101. doi:10.1021/acs.nanolett.1c01502.

Cite as: https://hdl.handle.net/21.11116/0000-0008-E9AA-2
The coexistence of ferroelectricity and metallicity seems paradoxical, since the itinerant electrons in metals should screen the long-range dipole interactions necessary for dipole ordering. The recent discovery of the polar metal LiOsO3 was therefore surprising [as discussed earlier in Y. Shi et al., Nat. Mater. 2013, 12, 1024]. It is thought that the coordination preferences of the Li play a key role in stabilizing the LiOsO3 polar metal phase, but an investigation from the combined viewpoints of core-state specificity and symmetry has yet to be done. Here, we apply the novel technique of extreme ultraviolet second harmonic generation (XUV-SHG) and find a sensitivity to the broken inversion symmetry in the polar metal phase of LiOsO3 with an enhanced feature above the Li K-edge that reflects the degree of Li atom displacement as corroborated by density functional theory calculations. These results pave the way for time-resolved probing of symmetry-breaking structural phase transitions on femtosecond time scales with element specificity.