Conflicting evidence for ferroelectricity

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Figure 1: Vibrational spectra of LASO compound 1·2.
Figure 2: Dielectric measurements for LASO compound 1·2.

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Author information

Affiliations

Authors

Contributions

G.D. and A.G. designed the research and wrote the Comment with contributions from the other authors. Experimental work was performed by M.S. and I.R. (materials synthesis and crystallization), X.F. (X-ray diffraction), M.M. (vibrational spectra) and J.K.H.F. (dielectric measurements). G.D. and G.G. performed DFT calculations. All authors discussed the results and contributed to data analysis.

Corresponding author

Correspondence to Gabriele D’Avino.

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The authors declare no competing financial interests.

Extended data figures and tables

Extended Data Figure 1 Raman spectra of compounds 1, 2 and 1·2.

The negligible frequency variation of the C=O mode between 1 and 1·2 further confirms the very small charge transfer (ρ ≈ 0) in the co-crystal, as is also evident from the infrared spectra in Fig. 1c. Raman intensity is given in counts per second per mW of laser power.

Extended Data Figure 2 Additional electric measurements for LASO compound 1·2.

a, Picture of two of the single crystals of 1·2 after removal of the contacts. The measured crystals are of good quality, with smooth surfaces and no branching or splintering. b, Electric-field-dependent polarization of 1·2 at 7 K (circles). c, d, Room-temperature time-dependent excitation field (c) and current response (d) of the positive-up, negative-down measurements. The responses of pulses I and II are identical, just as the responses of pulses III and IV are identical, indicating the absence of polar order.

Extended Data Table 1 DFT calculations for the three LASO crystals of ref. 1

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Supplementary Information

This file contains Supplementary Text, Supplementary Figures 1-5, Supplementary Table 1 and Supplementary References. (PDF 1258 kb)

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D’Avino, G., Souto, M., Masino, M. et al. Conflicting evidence for ferroelectricity. Nature 547, E9–E10 (2017). https://doi.org/10.1038/nature22801

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