Study of lattice contribution to the quantum spin liquid properties in molecular dimer-Mott insulator k-(BEDT-TTF)2Cu2(CN)3
Molecular dimer-Mott insulators have been in the focus of recent scientific attention due to the wealth of intriguing phenomena including spin liquid behavior, bandwidth-controlled Mott-transition, unconventional superconductivity, and electronic ferroelectricity. In 2014, we initiated first inelastic neutron scattering (INS) experiments on k-(BEDT-TTF)2Cu[N(CN)2]Cl (k-Cl) which exhibits electronic ferroelectricity below TFE ~TN ~25 K, using the triple axis spectrometer IN8. We succeeded to obtain clear phonon signals and found phonon damping in a wide temperature range, which we assign to structural fluctuations coupled to the charge and spin degrees of freedom in the BEDT-TTF molecules. The dielectric response in k-Cl has a striking analogy to that observed in another molecular dimer-Mott insulator namely k-(BEDT-TTF)2Cu2(CN)3 (k-CN), which has become prominent because of its putative spin liquid properties. In this proposal, we aim at comparing the lattice dynamics between k-CN and k-Cl allow for a deep understanding of the coupling of the lattice to the spin degrees of freedom.
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MATSUURA Masato; LANG Micheal; MUELLER Jens; PIOVANO Andrea; SASAKI Takahiko; STOCKERT Oliver and VALENTI Roser. (2021). Study of lattice contribution to the quantum spin liquid properties in molecular dimer-Mott insulator k-(BEDT-TTF)2Cu2(CN)3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-513
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