Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate $κ$-(BEDT-TTF)$_{2}$Cu$_{2}$(CN)$_{3}$

The low-temperature state of the quantum spin liquid candidate $κ$ -(BEDT-TTF) $_{2}$ Cu $_{2}$ (CN) $_{3}$ emerges via an anomaly at $T^{*} \sim 6$ 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) $_{2}$ Cu $_{2}$ (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.

Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate $κ$ -(BEDT-TTF) $_{2}$ Cu $_{2}$ (CN) $_{3}$

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Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate $κ$ -(BEDT-TTF) $_{2}$ Cu $_{2}$ (CN) $_{3}$

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Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate κκ-(BEDT-TTF)22​Cu22​(CN)33​

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Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate κκ-(BEDT-TTF)22​Cu22​(CN)33​

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Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate $κ$ -(BEDT-TTF) $_{2}$ Cu $_{2}$ (CN) $_{3}$

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Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate $κ$ -(BEDT-TTF) $_{2}$ Cu $_{2}$ (CN) $_{3}$

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