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Open AccessFeature PaperArticle

Phase Separation and Pairing Fluctuations in Oxide Materials

Department of Physics & Astronomy, California State University Long Beach, Long Beach, CA 90840, USA
Institute of Physics, University of Tartu, 1 W. Ostwaldi Street, 50411 Tartu, Estonia
MPI for Solid State Research Heisenbergstraße 1, 70569 Stuttgart, Germany
Institut für Physik, BTU Cottbus, P.O. Box 101344, 03013 Cottbus, Germany
Author to whom correspondence should be addressed.
Condens. Matter 2020, 5(4), 65;
Received: 12 September 2020 / Revised: 6 October 2020 / Accepted: 13 October 2020 / Published: 19 October 2020
The microscopic mechanism of charge instabilities and the formation of inhomogeneous states in systems with strong electron correlations is investigated. We demonstrate that within a strong coupling expansion the single-band Hubbard model shows an instability towards phase separation and extend the approach also for an analysis of phase separation in the Hubbard-Kanamori hamiltonian as a prototypical multiband model. We study the pairing fluctuations on top of an inhomogeneous stripe state where superconducting correlations in the extended s-wave and d-wave channels correspond to (anti)bound states in the two-particle spectra. Whereas extended s-wave fluctuations are relevant on the scale of the local interaction parameter U, we find that d-wave fluctuations are pronounced in the energy range of the active subband which crosses the Fermi level. As a result, low energy spin and charge fluctuations can transfer the d-wave correlations from the bound states to the low energy quasiparticle bands. Our investigations therefore help to understand the coexistence of stripe correlations and d-wave superconductivity in cuprates. View Full-Text
Keywords: phase separation; cuprate superconductors; electronic correlations phase separation; cuprate superconductors; electronic correlations
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Bill, A.; Hizhnyakov, V.; Kremer, R.K.; Seibold, G.; Shelkan, A.; Sherman, A. Phase Separation and Pairing Fluctuations in Oxide Materials. Condens. Matter 2020, 5, 65.

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