Study of critical elasticity at the critical endpoint in molecular dimer-Mott insulator k-(BEDT-TTF)2Cu[N(CN)2]Br
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 performed INS measurements on deuterated k-(BEDT-TTF)2Cu[N(CN)2]Cl (k-Cl in short) and found phonon anomaly which is a clear signature of the coupling of the lattice to the intra-dimer charge degrees of freedom. Mott metal-insulator transition (MIT) can be induced either by applying moderate pressure (30 MPa) to k-Cl, or by changing the anion, e.g. to X = Cu[N(CN)2]Br (k-Br). Further fine tuning is possible by deuteration in combination with varying the cooling rate around Tg~75 K. Recently, some of the proposers found, via measurements of relative length changes in thermal expansion around the second-order critical endpoint of the first-order Mott-transition line. In this proposal, we aim at identifying the anomalous lattice dynamics giving rise to the proposed phenomenon of critical elasticity at the critical endpoint in deuterated k-Br.
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MATSUURA Masato; LANG Micheal; MUELLER Jens; PIOVANO Andrea; SASAKI Takahiko; STOCKERT Oliver and VALENTI Roser. (2019). Study of critical elasticity at the critical endpoint in molecular dimer-Mott insulator k-(BEDT-TTF)2Cu[N(CN)2]Br. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-500
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