Universal properties of high temperature superconductors from real space pairing t-J-U model and its quantitative comparison with experiment

J. Spałek, M. Zegrodnik, J. Kaczmarczyk, Physical Review B - Condensed Matter and Materials Physics 95 (2017).


Journal Article | Published | English
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Abstract
Selected universal experimental properties of high-temperature superconducting (HTS) cuprates have been singled out in the last decade. One of the pivotal challenges in this field is the designation of a consistent interpretation framework within which we can describe quantitatively the universal features of those systems. Here we analyze in a detailed manner the principal experimental data and compare them quantitatively with the approach based on a single-band model of strongly correlated electrons supplemented with strong antiferromagnetic (super)exchange interaction (the so-called t−J−U model). The model rationale is provided by estimating its microscopic parameters on the basis of the three-band approach for the Cu-O plane. We use our original full Gutzwiller wave-function solution by going beyond the renormalized mean-field theory (RMFT) in a systematic manner. Our approach reproduces very well the observed hole doping (δ) dependence of the kinetic-energy gain in the superconducting phase, one of the principal non-Bardeen-Cooper-Schrieffer features of the cuprates. The calculated Fermi velocity in the nodal direction is practically δ-independent and its universal value agrees very well with that determined experimentally. Also, a weak doping dependence of the Fermi wave vector leads to an almost constant value of the effective mass in a pure superconducting phase which is both observed in experiment and reproduced within our approach. An assessment of the currently used models (t−J, Hubbard) is carried out and the results of the canonical RMFT as a zeroth-order solution are provided for comparison to illustrate the necessity of the introduced higher-order contributions.
Publishing Year
Date Published
2017-01-13
Journal Title
Physical Review B - Condensed Matter and Materials Physics
Volume
95
Issue
2
Article Number
024506
ISSN
IST-REx-ID

Cite this

Spałek J, Zegrodnik M, Kaczmarczyk J. Universal properties of high temperature superconductors from real space pairing t-J-U model and its quantitative comparison with experiment. Physical Review B - Condensed Matter and Materials Physics. 2017;95(2). doi:10.1103/PhysRevB.95.024506
Spałek, J., Zegrodnik, M., & Kaczmarczyk, J. (2017). Universal properties of high temperature superconductors from real space pairing t-J-U model and its quantitative comparison with experiment. Physical Review B - Condensed Matter and Materials Physics, 95(2). https://doi.org/10.1103/PhysRevB.95.024506
Spałek, Jozef, Michał Zegrodnik, and Jan Kaczmarczyk. “Universal Properties of High Temperature Superconductors from Real Space Pairing T-J-U Model and Its Quantitative Comparison with Experiment.” Physical Review B - Condensed Matter and Materials Physics 95, no. 2 (2017). https://doi.org/10.1103/PhysRevB.95.024506.
J. Spałek, M. Zegrodnik, and J. Kaczmarczyk, “Universal properties of high temperature superconductors from real space pairing t-J-U model and its quantitative comparison with experiment,” Physical Review B - Condensed Matter and Materials Physics, vol. 95, no. 2, 2017.
Spałek J, Zegrodnik M, Kaczmarczyk J. 2017. Universal properties of high temperature superconductors from real space pairing t-J-U model and its quantitative comparison with experiment. Physical Review B - Condensed Matter and Materials Physics. 95(2).
Spałek, Jozef, et al. “Universal Properties of High Temperature Superconductors from Real Space Pairing T-J-U Model and Its Quantitative Comparison with Experiment.” Physical Review B - Condensed Matter and Materials Physics, vol. 95, no. 2, 024506, American Physical Society, 2017, doi:10.1103/PhysRevB.95.024506.

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