Pseudogap and superconductivity in two-dimensional doped charge-transfer insulators

L. Fratino, P. Sémon, G. Sordi, and A.-M. S. Tremblay
Phys. Rev. B 93, 245147 – Published 24 June 2016
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Abstract

High-temperature superconductivity emerges upon doping a state of matter that is insulating because of interactions. A widely studied model considers one orbital per CuO2 unit cell on a square lattice with a strong intraorbital repulsion that leads to a so-called Mott-Hubbard insulator. Here we solve a model that takes into account, within each unit cell, two oxygen orbitals where there is no electron-electron repulsion and a copper orbital with strong electron-electron repulsion. The insulating phase is a so-called charge-transfer insulator, not a Mott-Hubbard insulator. Using cluster dynamical mean-field theory with continuous-time quantum Monte Carlo as an impurity solver and 12 atoms per cluster, we report the normal and superconducting phase diagram of this model as a function of doping, interaction strength, and temperature. As expected, the three-orbital model is consistent with the experimental observation that doped holes are located predominantly on oxygens, a result that goes beyond the one-orbital model. Nevertheless, the phase boundary between pseudogap and correlated metal, the Widom line, and the origin of the pairing energy (kinetic vs potential) are similar to the one-orbital model, demonstrating that these are emergent phenomena characteristic of doped Mott insulators, independently of many microscopic details. Broader implications are discussed.

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  • Received 27 February 2016
  • Revised 18 April 2016

DOI:https://doi.org/10.1103/PhysRevB.93.245147

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

L. Fratino1, P. Sémon2, G. Sordi1, and A.-M. S. Tremblay2,3

  • 1Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
  • 2Département de Physique and Regroupement Québéquois sur les Matériaux de Pointe, Université de Sherbrooke, Sherbrooke, Québec, Canada, J1K 2R1
  • 3Canadian Institute for Advanced Research, Toronto, Ontario, Canada, M5G 1Z8

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Issue

Vol. 93, Iss. 24 — 15 June 2016

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