White-Scalapino-like stripes in a mean-field Hubbard model

Kusko, C.; Markiewicz, R. S.

doi:10.1103/physrevb.65.041102

Cited by 3 publications

(2 citation statements)

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“…For a critical U/t one then finally finds a first order transition towards either Néel order Q = (π, π) or towards linear antiferromagnetic (LAF) order at Q = (π, 0) [or equivalently Q = (0, π)]. 9 This first order transition involves a topological transition of the Fermi surface, from a spiral phase with pockets to a fully gapped commensurate phase.…”

Section: Resultsmentioning

confidence: 99%

Gutzwiller magnetic phase diagram of the undopedt−t′−UHubbard model

2010

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We calculate the magnetic phase diagram of the half-filled t − t − U Hubbard model as a function of t and U , within the Gutzwiller approximation RPA (GA+RPA). As U increases, the system first crosses over to one of a wide variety of incommensurate phases, whose origin is clarified in terms of double nesting. We evaluate the stability regime of the incommensurate phases by allowing for symmetry-breaking with regard to the formation of spin spirals, and find a crossover to commensurate phases as U increases and a full gap opens. The results are compared with a variety of other recent calculations, and in general good agreement is found. For parameters appropriate to the cuprates, double occupancy should be only mildly suppressed in the absence of magnetic order, inconsistent with a strong coupling scenario.PACS numbers:

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Section: Resultsmentioning

confidence: 99%

Gutzwiller magnetic phase diagram of the undopedt−t′−UHubbard model

2010

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“…In addition, if the finite thickness case is considered, the variability of Z d becomes even bigger. In conclusion, the study of these structures and the identification of spurious effects due to the geometry and to the physical properties of the substrate is of interest both from the technological point of view, since Z s is a relevant performance parameter, and from a fundamental point of view, since exotic properties of HTCSs show up as surface impedance anomalies [14]. In this paper, therefore, we report and analyse measurements at two distinct frequencies of the effective surface impedance Z s of a YBa 2 Cu 3 O 7−δ film grown on a silicon substrate.…”

Section: Introductionmentioning

confidence: 99%

Effective surface impedance of Y Ba₂Cu₃O_7−δfilms on silicon substrates

Pompeo

Marcon

Méchin

et al. 2005

Supercond. Sci. Technol.

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We study the effect of the substrate on the effective surface impedance of a YBa 2 Cu 3 O 7−δ thin film grown over a silicon substrate. The microwave measurements, performed with a resonant cavity technique at two distinct frequencies (24 and 48 GHz), show anomalies both in the temperature and in the frequency dependences. By properly taking into account a relevant complex substrate contribution, with an important role played by the finite thickness effect, the whole set of data finds a satisfactory explanation in terms of standard impedance transformations. Using independent measurements at a single temperature, it is possible to extract the temperature dependence of the YBa 2 Cu 3 O 7−δ bulk surface impedance, which shows the expected frequency and temperature behaviours.

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Density functional theory study of water adsorption at reduced and stoichiometric ceria (111) surfaces

Kumar¹,

Schelling²

2006

The Journal of Chemical Physics

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We study the structure and energetics of water molecules adsorbed at ceria (111) surfaces for 0.5 and 1.0 ML coverages using density functional theory. The results of this study provide a theoretical framework for interpreting recent experimental results on the redox properties of water at ceria (111) surfaces. In particular, we have computed the structure and energetics of various absorption geometries at the stoichiometric ceria (111) surface. We find that single hydrogen bonds between the water and the oxide surface are favored in all cases. At stoichiometric surfaces, the water adsorption energy depends rather weakly on coverage. We predict that the observed coverage dependence of the water adsorption energy at stoichiometric surfaces is likely the result of dipole-dipole interactions between adsorbed water molecules. When oxygen vacancies are introduced in various surface layers, water molecules are attracted more strongly to the surface. We find that it is very slightly energetically favorable for adsorbed water to oxidized the reduced (111) surface with the evolution of H(2). In the event that water does not oxidize the surface, we predict that the effective attractive water-vacancy interaction will result in a significant enhancement of the vacancy concentration at the surface in agreement with experimental observations. Finally, we present our results in the context of recent experimental and theoretical studies of vacancy clustering at the (111) ceria surface.

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White-Scalapino-like stripes in a mean-field Hubbard model

Cited by 3 publications

References 30 publications

Gutzwiller magnetic phase diagram of the undopedt−t′−UHubbard model

Gutzwiller magnetic phase diagram of the undopedt−t′−UHubbard model

Effective surface impedance of Y Ba₂Cu₃O_7−δfilms on silicon substrates

Density functional theory study of water adsorption at reduced and stoichiometric ceria (111) surfaces

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White-Scalapino-like stripes in a mean-field Hubbard model

Cited by 3 publications

References 30 publications

Gutzwiller magnetic phase diagram of the undopedt−t′−UHubbard model

Gutzwiller magnetic phase diagram of the undopedt−t′−UHubbard model

Effective surface impedance of Y Ba2Cu3O7−δfilms on silicon substrates

Density functional theory study of water adsorption at reduced and stoichiometric ceria (111) surfaces

Contact Info

Product

Resources

About

Effective surface impedance of Y Ba₂Cu₃O_7−δfilms on silicon substrates