Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.027601
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Funding
- Japan Society for the Promotion of Science [25287080, 19H01833, 16K05430, 18H04298]
- Deutsche Forschungsgemeinschaft (DFG) within the collaborative research center SFB/TR 49 Condensed Matter Systems with Variable Many-Body Interactions
- Grants-in-Aid for Scientific Research [18H04298, 19H01833, 16K05430] Funding Source: KAKEN
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Inelastic neutron scattering measurements on the molecular dimer-Mott insulator kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl reveal a phonon anomaly in a wide temperature range. Starting from T-ins similar to 50-60 K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature T-N = 27 K, where also a ferroelectric ordering at T-FE approximate to T-N occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below T-N, while no change of the lattice symmetry is observed across T-N in neutron diffraction measurements. We assign the phonon anomalies to structural fluctuations coupled to charge and spin degrees of freedom in the BEDT-TTF molecules.
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