期刊
PHYSICAL REVIEW RESEARCH
卷 4, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.4.L042047
关键词
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资金
- Japan Society for the Promotion of Science [19H01833, 19K03723, 20H05144, 22H04459]
- Deutsche Forschungsgemeinschaft (DFG, German Science Foundation) [TRR 288-422213477]
The low-temperature state of the quantum spin liquid candidate K-(BEDT-TTF)2Cu2(CN)3 undergoes an anomaly at T*, which is revealed by the drastic change in phonon damping. This change is attributed to a phase transition into a valence bond solid state based on an effective model describing the spin-charge coupling in this system.
The low-temperature state of the quantum spin liquid candidate K-(BEDT-TTF)2Cu2(CN)3 emerges via an anomaly at T* ti 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 K-(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.
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