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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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Journal ArticleDOI
01 Mar 2009
TL;DR: In this paper, the authors investigated the electronic states of the two-orbital Hubbard model by means of the composite opeator method and introduced the off-diagonal transfer t', which provides the mixing of orbitals.
Abstract: Electronic states of the two-orbital Hubbard model are investigated by means of the composite opeator method. In addition to the transfer within the same kind of orbital, we introduce the off-diagonal transfer t', which provides the mixing of orbitals. In the t' = 0 case, the system shows the orbital selective Mott transition at U = 4. Upon adding t', the band gap goes wider. This increase of the gap originates from the crossover between the Mott-insulator and the band-insulator.

1 citations

Journal ArticleDOI
TL;DR: La constante de Mott obtenue en tenant compte du desordre est en meilleur accord avec les resultats experimentaux.
Abstract: Calcul de la constante de Mott dans les semiconducteurs du tyupe-n base sur le modele Krieger-Nightingale incorporant les effets de desordre via un potentiel d'impurete statistique modele. Consideration de plusieurs potentiels d'impurete. Presentation des energies de liaison des donneurs, de v2, et de la densite de probabilite radiale, en fonction de la concentration en impurete. La constante de Mott obtenue en tenant compte du desordre est en meilleur accord avec les resultats experimentaux

1 citations

Posted ContentDOI
TL;DR: In this article, the specific heat in Ca$_3$(Ru$_{1-x}M_x$)$_2$O$_7$ ($M$ = Ti, Fe, Mn) single crystals with different dopants and doping levels was investigated.
Abstract: We present a detailed investigation of the specific heat in Ca$_3$(Ru$_{1-x}M_x$)$_2$O$_7$ ($M$ = Ti, Fe, Mn) single crystals. With different dopants and doping levels, three distinct regions are present, including a quasi-2D metallic state with an antiferromagnetic (AFM) order formed by ferromagnetic bilayers (AFM-$b$), a Mott insulating state with G-type AFM order (G-AFM) and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mott transitions induced by Ti and Mn dopings. We observed not only an anomalous large mass enhancement but also an additional term in the specific heat i.e. $C\propto T^2$ in the localized region. The $C\propto T^2$ term is most likely due to the long-wavelength excitations with both FM and AFM components. A decrease of Debye temperature is observed in the G-type AFM region, indicating a lattice softening associated with the Mott transition.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the Exact-Diagonalization (ED) technique is applied to the Single Site Impurity Anderson Model (SIAM) and the Periodic Anderson model (PAM) to elucidate the nature of the ground-state energy and the phase diagram of the two models.
Abstract: The Exact-Diagonalization (ED) technique is applied to the Single Site Impurity Anderson Model (SIAM) and the Periodic Anderson Model (PAM) to elucidate the nature of the ground-state energy and the phase diagram of the two models. The results obtained show a smooth phase transition from an antiferromagnetic (Metal) phase to a ferromagnetic (Insulator) phase at slightly away from half filling in the two electrons on three site lattice system (1-D) as the value of hopping matrix element, t increases in the SIAM and PAM. Experimental observation shows that increasing the Ce content in CeCu 2 Si 2 leads to a phase transition from a Metallic to an Insulating phase. Keywords: Antiferromagnetism, Ferromagnetism, Metal, Insulator, Transition point Journal of the Nigerian Association of Mathematical Physics , Volume 19 (November, 2011), pp 565 – 570

1 citations

Posted Content
TL;DR: In this article, the effect of small doping on the Mott transition was considered and it was shown that it leads to a quantum gas-liquid coexistence phase, which belongs to the Ising universality class and which is consistent with several experimental observations.
Abstract: su(2) 1 . The Mott transition is of topological nature, characterized by the emergence of vortices in antiferromagnetic arrays interacting strongly with the electric charges and an electric-magnetic duality. We also consider the effect of small doping on this theory and show that it leads to a quantum gas-liquid coexistence phase, which belongs to the Ising universality class and which is consistent with several experimental observations.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202271
202165
202064
201968
201871