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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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TL;DR: In this article, the spin-singlet Mott phase and the nematic mott phase were investigated in high-dimensional bipartite lattices and it was shown that phase transitions are generally weakly first order.
Abstract: We present microscopic wave functions of spin-singlet Mott insulating states and nematic Mott insulating states. We also investigate quantum phase transitions between the spin-singlet Mott phase and the nematic Mott phase in both large-N limit and small-N limit ( N being the number of particles per site! in high-dimensional bipartite lattices. In the mean-field approximation employed in this article we find that phase transitions are generally weakly first order.

44 citations

Journal ArticleDOI
TL;DR: Ab-initio theoretical method for correlated electron materials is developed, based on Dynamical Mean Field Theory, which can predict the change of the crystal structure across the MIT at finite temperature, and it is shown that the line-shape of the measured resonant elastic X-ray response can be explained with the “site-selective” Mott scenario without real charge order on Ni sites.
Abstract: The metal-insulator transition (MIT) remains among the most thoroughly studied phenomena in solid state physics, but the complexity of the phenomena, which usually involves cooperation of many degrees of freedom including orbitals, fluctuating local moments, magnetism, and the crystal structure, have resisted predictive ab-initio treatment. Here we develop ab-initio theoretical method for correlated electron materials, based on Dynamical Mean Field Theory, which can predict the change of the crystal structure across the MIT at finite temperature. This allows us to study the coupling between electronic, magnetic and orbital degrees of freedom with the crystal structure across the MIT in rare-earth nickelates. We predict the electronic free energy profile of the competing states, and the theoretical magnetic ground state configuration, which is in agreement with neutron scattering data, but is different from the magnetic models proposed before. The resonant elastic X-ray response at the K-edge, which was argued to be a probe of the charge order, is theoretically modelled within the Dynamical Mean Field Theory, including the core-hole interaction. We show that the line-shape of the measured resonant elastic X-ray response can be explained with the “site-selective” Mott scenario without real charge order on Ni sites.

44 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of Mn site substitution of Al on the structural, magnetic and transport properties of charge ordered Pr0.5Ca 0.5MnO3 was investigated.
Abstract: We report on the effect of Mn site substitution of Al on the structural, magnetic and transport properties of charge ordered Pr0.5Ca0.5MnO3. This substitution introduces non-magnetic impurities in the Mn–O–Mn network, causes the Mn3+/Mn4+ ratio to deviate away from unity and is seen to predominantly replace Mn4+ without introducing any appreciable change in the structure. The strength of charge ordering is suppressed with increasing Al doping, as is seen from AC susceptibility, the magnetocaloric effect and DC resistivity. The observation of traces of charge ordering over an extended range of impurity doping of 10%, besides being indicative of the robust nature of charge ordering in Pr0.5Ca0.5MnO3, also underscores the relatively insignificant effect that Al substitution has on the lattice distortions and the importance of non-magnetic substitutions. For all the samples, the conductivity in the temperature range above the charge ordering transition is observed to be due to the adiabatic hopping of small polarons, whereas below the charge ordering transition, Mott's variable range hopping mechanism is seen to be valid.

44 citations

Journal ArticleDOI
TL;DR: In this article, the crystal structures of two Pd(dmit) 2 -based molecular conductors, Et 2 Me 2 Sb and Cs, above and below their phase transition temperatures were studied.
Abstract: We have studied crystal structures of two Pd(dmit) 2 -based molecular conductors, Et 2 Me 2 Sb[Pd(dmit) 2 ] 2 and Cs[Pd(dmit) 2 ] 2 , above and below their phase transition temperatures. The Et 2 Me 2 Sb salt undergoes a first-order transition from a Mott insulator to a non-magnetic state at ca. 70 K, while the Cs salt exhibits a metal-to-insulator (M–I) transition at ca. 56 K with decreasing temperature. These salts are composed of crystallographically equivalent dimeric units [Pd(dmit) 2 ] 2 - above the transition temperatures. The low temperature structures have been revealed to have two crystallographically independent dimers arranged alternately along the b axis. The structural changes of the dimers have been analyzed by calculations of overlap integrals, to show that the degree of the dimerization changes through the phase transitions. This indicates that both of the phase transitions are characterized by the charge separation, 2dimer - →dimer 0 + dimer 2- . Crystal structure of a related compound, ...

44 citations

Journal ArticleDOI
TL;DR: In this paper, the Mott phase and the superfluid-insulator transition of two-component ultracold bosons on a square optical lattice were studied in the presence of a non-Abelian synthetic gauge field, which renders a SU(2)-hopping matrix for the bosons.
Abstract: We study the Mott phases and the superfluid-insulator transition of two-component ultracold bosons on a square optical lattice in the presence of a non-Abelian synthetic gauge field, which renders a SU(2)-hopping matrix for the bosons. Using a resummed hopping expansion, we calculate the excitation spectra in the Mott insulating phases and demonstrate that the superfluid-insulator phase boundary displays a nonmonotonic dependence on the gauge-field strength. We also compute the momentum distribution of the bosons in the presence of the non-Abelian field and show that they develop peaks at nonzero momenta as the superfluid-insulator transition point is approached from the Mott side. Finally, we study the superfluid phases near the transition and discuss the induced spatial pattern of the superfluid density due to the presence of the non-Abelian gauge potential.

44 citations


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