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The authors declare no competing financial interests.
Extended data figures and tables
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.
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.
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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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