Self-doping effect arising from electron correlations in multi-layer cuprates

Abstract

A self-doping effect between outer and inner CuO${}_2$ planes (OPs and IPs) in multi-layer cuprate superconductors is studied. When one considers a three-layer tight-binding model of the Hg-based three-layer cuprate derived from the first principle calculations, the electron concentration gets to be large in the OP compared to IP. This is inconsistent with the experimental fact that more hole carriers tend to be introduced into the OP than IP.We investigate a three-layer Hubbard model with the two-particle self-consistent approach for multi-layer systems to incorporate electron correlations. We observe that the double occupancy (antiferromagnetic instability) in the IP decreases (increases) more than the OP, and also reveal that more electrons tend to be introduced into the IP than OP to obtain the energy gain from the on-site Hubbard interaction. These results are consistent with the experimental facts, and this electron distribution between the OP and IP can be interpreted as a self-doping effect arising from strong electron correlations.

5 pages, 7 figures, to be submitted in Journal of the Physical Society of Japan

References in corpus (2)

• An explanation for a universality of transition temperatures in families of copper oxide superconductors
• Development of a two-particle self-consistent method for multi-orbital systems and its application to unconventional superconductors

Cited by in corpus (4)

• Two-Particle Self-Consistent method for the multi-orbital Hubbard model
• Superconductivity arising from layer-differentiation in multi-layer cuprates
• Pairing susceptibility in the weakly interacting multilayer Hubbard model evaluated by direct perturbative expansion
• Material Optimization of Potential High-$T_{\text{c}}$ Superconducting Single-layer Cuprates