Journal
PHYSICAL REVIEW B
Volume 91, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.245132
Keywords
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Funding
- Deutsche Forschungsgemeinschaft through the Transregional Collaborative Research Centers [TRR 80, TRR 49]
- BMBF via ENREKON
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A detailed investigation of the out-of-plane electrical properties of charge-ordered alpha-(BEDT-TTF)(2)I-3 provides clear evidence for ferroelectricity. Similar to multiferroic kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl, the polar order in this material is ascribed to the occurrence of bond- and site-centered charge order. Dielectric response typical for relaxor ferroelectricity is found deep in the charge-ordered state. We suggest an explanation in terms of the existence of polar and nonpolar stacks of the organic molecules in this material, preventing long-range ferroelectricity. The results are discussed in relation to the formation or absence of electronic polar order in related charge-transfer salts.
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