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- W2956550184 abstract "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 $T_{rm ins}sim50$-$60$ K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature $T_mathrm{N} = 27$ K, where also a ferroelectric ordering at $T_{rm FE} approx T_{rm N}$ occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below $T_mathrm{N}$, while no change of the lattice symmetry is observed across $T_mathrm{N}$ 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." @default.
- W2956550184 created "2019-07-23" @default.
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- W2956550184 date "2019-07-10" @default.
- W2956550184 modified "2023-10-17" @default.
- W2956550184 title "Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>κ</mml:mi><mml:mtext>−</mml:mtext><mml:mo stretchy=false>(</mml:mo><mml:mi>BEDT</mml:mi><mml:mtext>−</mml:mtext><mml:mi>TTF</mml:mi><mml:msub><mml:mrow><mml:mo stretchy=false>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mi>Cu</mml:mi><mml:mo stretchy=false>[</mml:mo><…" @default.
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- W2956550184 doi "https://doi.org/10.1103/physrevlett.123.027601" @default.
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