论文标题
量子旋转液体候选$κ$ - （bedt-ttf）$ _ {2} $ _ {2} $ cu $ _ {2} $（cn）$ _ {3}
Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate $κ$-(BEDT-TTF)$_{2}$Cu$_{2}$(CN)$_{3}$
论文作者
论文摘要
量子旋转液体候选$κ$ - （bedt-ttf）$ _ {2} $ cu $ _ {2} $（cn）$ _ {3} $的低温状态是通过$ t^{*} \ sim6 $K。在这里，我们报告了$κ$ - （bedt-ttf）$ _ {2} $ cu $ _ {2} $（CN）$ _ {3} $的单晶上的非弹性中子散射测量值，旨在研究以$ t^{*} $的方式研究以$ t^{*} $的语音重构化效果。对于$ e = 4.7 $ meV的呼吸模式，在$ t {*} $的声子阻尼中观察到了急剧变化。声子阻尼的突然变化归因于基于描述此二聚体莫特系统中旋转荷尔兰耦合的有效模型，归因于价键固态。
The low-temperature state of the quantum spin liquid candidate $κ$-(BEDT-TTF)$_{2}$Cu$_{2}$(CN)$_{3}$ emerges via an anomaly at $T^{*}\sim6$ 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.
