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Relaxor ferroelectricity induced by electron correlations in a molecular dimer Mott insulator
- Publication Year :
- 2012
-
Abstract
- We have investigated the dielectric response in an antiferromagnetic dimer-Mott insulator beta'-(BEDT-TTF)2ICl2 with square lattice, compared to a spin liquid candidate kappa-(BEDT-TTF)2Cu2(CN)3. Temperature dependence of the dielectric constant shows a peak structure obeying Curie-Weiss law with strong frequency dependence. We found an anisotropic ferroelectricity by pyrocurrent measurements, which suggests the charge disproportionation in a dimer. The ferroelectric actual charge freezing temperature is related to the antiferromagnetic interaction, which is expected to the charge-spin coupled degrees of freedom in the system.<br />Comment: 5 pages, 4 figures, to be published in Phys. Rev. B
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Subjects
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1208.0633
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.87.075107