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Propriétés de transport de systèmes électroniques fortement corrélés

Abstract : Transport properties of the two strongly correlated systems (V0.989 Cr0.011)2O3 and k-(BEDT-TTF)2 Cu[N(CN)2]Cl have been investigated in the vicinity of the Mott transition as a function of pressure and temperature. A variable pressure technique, at low and high temperatures, has allowed a determination of the coexistence regions between metallic and insulating states defined by hysteresis cycles up to the critical point (TC, PC). Critical behaviour of the conductivity in (V0.989 Cr0.011)2O3 has displayed a complete analogy with liquid-gas transition, in accordance with theoretical prediction obtained in the frame of DMFT model. The scaling analysis has demonstrated that the universality of the Mott transition was these of the 3D Ising model. For the two materials, we have detected in the insulating state an activated behaviour of the resistivity with a gap decreasing with pressure but still finite and much bigger than temperature before transition. Besides, metallic transport has exhibited a first crossover between a low temperature Fermi liquid regime (T>T*) between the incoherent metallic regime and an insulating regime.
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Contributor : Patrice Limelette <>
Submitted on : Monday, October 13, 2003 - 2:55:43 PM
Last modification on : Wednesday, September 16, 2020 - 4:31:58 PM
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Patrice Limelette. Propriétés de transport de systèmes électroniques fortement corrélés. Matière Condensée [cond-mat]. Université Paris Sud - Paris XI, 2003. Français. ⟨tel-00003545⟩

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