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Phonon renormalization effects accompanying the 6 K anomaly in the quantum spin liquid candidate κ-(BEDT-TTF)2Cu2(CN)3

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Stockert,  Oliver
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Matsuura, M., Sasaki, T., Naka, M., Müller, J., Stockert, O., Piovano, A., et al. (2022). Phonon renormalization effects accompanying the 6 K anomaly in the quantum spin liquid candidate κ-(BEDT-TTF)2Cu2(CN)3. Physical Review Research, 4(4): L042047, pp. 1-6. doi:10.1103/PhysRevResearch.4.L042047.


Cite as: https://hdl.handle.net/21.11116/0000-000C-7324-A
Abstract
The low-temperature state of the quantum spin liquid candidate κ-(BEDT-TTF)2Cu2(CN)3 emerges via an anomaly at T∗∼6 K. Although signatures of this anomaly have been revealed in various quantities, its origin has remained unclear. Here we report inelastic neutron scattering measurements on single crystals of κ-(BEDT-TTF)2Cu2(CN)3, aiming at studying phonon renormalization effects at T∗. A drastic change was observed in the phonon damping across T∗ for a breathing mode of BEDT-TTF dimers at E=4.7 meV. The abrupt change in the phonon damping is attributed to a phase transition into a valence bond solid state based on an effective model describing the spin-charge coupling in this dimer-Mott system. © 2022 authors. Published by the American Physical Society.