Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.147601
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Funding
- NSFC [21071030, 20931002, 90922005]
- Grants-in-Aid for Scientific Research [23655109, 23350085] Funding Source: KAKEN
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A new organic ferroelectric compound, 4-(cyanomethyl) anilinium perchlorate, proceeds a second-order phase transition from a paraelectric phase (P2(1)/m) to a ferroelectric phase (P2(1)) at 184 K. A perfect ferroelectric hysteresis loop was observed even at 10 KHz. It is the first example of a molecule-based organic ferroelectric whose polarization can be switched at such a high frequency. The temperature dependent second harmonic generation effect shows that the second-order nonlinear coefficient is nearly zero above T-c and proportional to the spontaneous polarization below T-c, suggesting the occurrence of symmetry breaking, in good agreement with crystal structural determination. The origin of ferroelectricity was ascribed to the displacements of -NH3+ cations and ClO4- anions from the symmetric positions including a small part of the order-disorder behaviors of the ClO4- anions.
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