Ferroelectric properties of charge-ordered alpha-(BEDT-TTF)2I3
P. Lunkenheimer, B. Hartmann, M. Lang, J. M\"uller, D. Schweitzer, S., Krohns, and A. Loidl
TL;DR
This study demonstrates ferroelectricity in charge-ordered alpha-(BEDT-TTF)2I3 through electrical and dielectric measurements, revealing relaxor behavior and the influence of molecular stacking on polar order.
Contribution
It provides the first detailed analysis of ferroelectric properties in alpha-(BEDT-TTF)2I3, linking charge order to ferroelectricity and proposing a model involving polar and nonpolar molecular stacks.
Findings
Evidence of ferroelectricity in alpha-(BEDT-TTF)2I3
Dielectric response characteristic of relaxor ferroelectrics
Polar and nonpolar molecular stacks influence long-range order
Abstract
A detailed investigation of the out-of-plane electrical properties of charge-ordered alpha-(BEDT-TTF)2I3 provides clear evidence for ferroelectricity. Similar to multiferroic alpha-(BEDT-TTF)2Cu[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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