Topic
Mott transition
About: Mott transition is a research topic. Over the lifetime, 2444 publications have been published within this topic receiving 78401 citations.
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01 Jan 1973
TL;DR: In this paper, the materials around the Mott transition lying in the linking region between the standard band and salt-like regimes are discussed, and some discussion is given of the materials in this region.
Abstract: Some discussion is given of the materials around the Mott transition lying in the linking region between the standard band and salt-like regimes.
1 citations
TL;DR: In this article, X-ray Rietveld analyses for BaCoS 2 under high pressure and magnetic excitation measurements were carried out for both BaCo 1− x Ni x S 2 at ambient pressure and BaCo S 2 with high pressure.
1 citations
Posted Content•
TL;DR: In this paper, the half-filled Hubbard model on the geometrically frustrated face centered cubic (FCC) lattice, using an auxiliary field based real space technique, was studied.
Abstract: We study the half-filled Hubbard model on the geometrically frustrated face centered cubic (FCC) lattice, using an auxiliary field based real space technique. The low temperature state is a paramagnetic metal at weak interaction, an antiferromagnetic insulator (AFI) with flux like order at intermediate interaction, and an AFI with `C type' order at very strong interaction. Remarkably, there is a narrow window between the paramagnetic metal and the AFI where the system exhibits spin glass behaviour arising from the presence of disordered but `frozen' local moments. The spin glass state is metallic at weaker interaction but shows crossover to pseudogap behaviour and an insulating resistivity with growing interaction. We compare our results to available experiments on FCC and pyrochlore based materials and suggest that several of these features are typical of three dimensional correlated systems with geometric frustration.
1 citations
Posted Content•
TL;DR: In this paper, the spin-singlet superconductivity without phonons was examined in consideration of correlations on an extended Hubbard model, and it was shown that the superconductivities required not only the total correlation should be strong enough but also the density of state around Fermi energy should be large enough.
Abstract: The spin-singlet superconductivity without phonons is examined in consideration of correlations on an extended Hubbard model. It is shown that the superconductivity requires not only the total correlation should be strong enough but also the density of state around Fermi energy should be large enough, which shows that the high temperature superconductivity could only be found in the metallic region near the Mott metal insulator transition (MIT). Other properties of superconductors are also discussed on these conclusions.
1 citations
Dissertation•
01 Jan 2003
TL;DR: In this paper, 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).
Abstract: Transport properties of two strongly correlated systems (V-0. 989 Cr-0. 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 (V-0. 989 Cr-0. 011)2O3 displays 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 class of the Mott transition was the one of the 3D Ising model. For both materials, we have detected an activated behaviour of the resistivity in the insulating state with a gap decreasing with pressure. This gap remains finite and much bigger than temperature before the transition into the metallic state. Moreover, metallic transport exhibits a crossover between a low temperature Fermi liquid regime (T >T*) between the incoherent metallic regime and an insulating regime.
1 citations