Anomalous Lattice Response at the Mott Transition in a Quasi-2D Organic Conductor

Simple item page
dc.creatorde Souza, M.
dc.creatorBruehl, A.
dc.creatorStrack, Ch.
dc.creatorWolf, B.
dc.creatorSchweitzer, D.
dc.creatorLang, M.
dc.date2006-10-20
dc.date2007-12-11
dc.date.accessioned2026-07-07T08:48:23Z
dc.date.available2026-07-07T08:48:23Z
dc.descriptionDiscontinuous changes of the lattice parameters at the Mott metal-insulator transition are detected by high-resolution dilatometry on deuterated crystals of the layered organic conductor $κ$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Br. The uniaxial expansivities uncover a striking and unexpected anisotropy, notably a zero-effect along the in-plane c-axis along which the electronic interactions are relatively strong. A huge thermal expansion anomaly is observed near the end-point of the first-order transition line enabling to explore the critical behavior with very high sensitivity. The analysis yields critical fluctuations with an exponent $\tildeα \simeq$ 0.8 $\pm$ 0.15 at odds with the novel criticality recently proposed for these materials [Kagawa \textit{et al.}, Nature \textbf{436}, 534 (2005)]. Our data suggest an intricate role of the lattice degrees of freedom in the Mott transition for the present materials.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0610576
dc.identifierhttp://arxiv.org/abs/cond-mat/0610576
dc.identifierPhysical Review Letters 99, 037003 (2007)
dc.identifierdoi:10.1103/PhysRevLett.99.037003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/143928
dc.subjectStrongly Correlated Electrons
dc.titleAnomalous Lattice Response at the Mott Transition in a Quasi-2D Organic Conductor
dc.typetext

Files

Collections

arXiv