2008
DOI: 10.1103/physrevb.77.014519
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Phase separation in the vicinity of quantum-critical doping concentration: Implications for high-temperature superconductors

Abstract: A general quantitative measure of the tendency towards phase separation is introduced for systems exhibiting phase transitions or crossovers controlled by charge carrier concentration. This measure is devised for the situations when the quantitative knowledge of various contributions to free energy is incomplete, and is applied to evaluate the chances of electronic phase separation associated with the onset of antiferromagnetic correlations in high-temperature cuprate superconductors. The experimental phenomen… Show more

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Cited by 23 publications
(14 citation statements)
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“…Recent discoveries suggest that phase separation is likely to occur in the vicinity of a metal-insulator transition (MIT) [22][23][24]. In contrast to one-dimensional systems, the 2D Hubbard model in both square and honeycomb lattices at half-filling is expected to exhibit a Mott-Hubbard MIT at finite onsite Coulomb interactions U in the paramagnetic phase at both zero and finite temperature [25][26][27][28][29][30]. In general, this transition at a finite U value might be an intrinsic property of the 2D Hubbard lattice [30].…”
Section: Introductionmentioning
confidence: 98%
“…Recent discoveries suggest that phase separation is likely to occur in the vicinity of a metal-insulator transition (MIT) [22][23][24]. In contrast to one-dimensional systems, the 2D Hubbard model in both square and honeycomb lattices at half-filling is expected to exhibit a Mott-Hubbard MIT at finite onsite Coulomb interactions U in the paramagnetic phase at both zero and finite temperature [25][26][27][28][29][30]. In general, this transition at a finite U value might be an intrinsic property of the 2D Hubbard lattice [30].…”
Section: Introductionmentioning
confidence: 98%
“…Such a texture can, indeed, emerge as a possible realization of Coulomb-frustrated phase separation. 20,21 In this work, we investigate spin responses of finite clusters of spins 1/2 described by the Heisenberg model, in an attempt to test whether the experimental phenomenology can be understood from a unified perspective of a finite-cluster simulations. We find that such an approach is indeed quite promising.…”
Section: Introductionmentioning
confidence: 99%
“…The phase segregated nonuniform states have lower energy as demonstrated in figure 1. Therefore, there is a tendency to phase separation into domains with a different carrier density x (for details see [22]…”
mentioning
confidence: 99%