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Title: Electron Doping of Cuprates via Interfaces with Manganites

Abstract

The electron doping of undoped high-$$T_c$$ cuprates via the transfer of charge from manganites (or other oxides) using heterostructure geometries is here theoretically discussed. This possibility is mainly addressed via a detailed analysis of photoemission and diffusion voltage experiments, which locate the Fermi level of manganites above the bottom of the upper Hubbard band of some cuprate parent compounds. A diagram with the relative location of Fermi levels and gaps for several oxides is presented. The procedure discussed here is generic, allowing for the qualitative prediction of the charge flow direction at several oxide interfaces. The addition of electrons to antiferromagnetic Cu oxides may lead to a superconducting state at the interface with minimal quenched disorder. %if the manganite used is not spin polarized. Model calculations using static and dynamical mean-field theory, supplemented by a Poisson equation formalism to address charge redistribution at the interface, support this view. The magnetic state of the manganites could be antiferromagnetic or ferromagnetic. The former is better to induce superconductivity than the latter, since the spin-polarized charge transfer will be detrimental to singlet superconductivity. It is concluded that in spite of the robust Hubbard gaps, the electron doping of undoped cuprates at interfaces appears possible, and its realization may open an exciting area of research in oxide heterostructures.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2]
  1. ORNL
  2. University of Tokyo, Tokyo, Japan
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
978749
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 76; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CUPRATES; DIFFUSION; ELECTRONS; FERMI LEVEL; FORECASTING; MEAN-FIELD THEORY; OXIDES; PHOTOEMISSION; POISSON EQUATION; SUPERCONDUCTIVITY; correlated-electron heterostructures; high-Tc superconductivity; CMR manganites

Citation Formats

Yunoki, Seiji, Moreo, Adriana, Dagotto, Elbio R, Okamoto, Satoshi, Kancharla, Srivenkateswara S, and Fujimori, A. Electron Doping of Cuprates via Interfaces with Manganites. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.76.064532.
Yunoki, Seiji, Moreo, Adriana, Dagotto, Elbio R, Okamoto, Satoshi, Kancharla, Srivenkateswara S, & Fujimori, A. Electron Doping of Cuprates via Interfaces with Manganites. United States. doi:10.1103/PhysRevB.76.064532.
Yunoki, Seiji, Moreo, Adriana, Dagotto, Elbio R, Okamoto, Satoshi, Kancharla, Srivenkateswara S, and Fujimori, A. Mon . "Electron Doping of Cuprates via Interfaces with Manganites". United States. doi:10.1103/PhysRevB.76.064532.
@article{osti_978749,
title = {Electron Doping of Cuprates via Interfaces with Manganites},
author = {Yunoki, Seiji and Moreo, Adriana and Dagotto, Elbio R and Okamoto, Satoshi and Kancharla, Srivenkateswara S and Fujimori, A},
abstractNote = {The electron doping of undoped high-$T_c$ cuprates via the transfer of charge from manganites (or other oxides) using heterostructure geometries is here theoretically discussed. This possibility is mainly addressed via a detailed analysis of photoemission and diffusion voltage experiments, which locate the Fermi level of manganites above the bottom of the upper Hubbard band of some cuprate parent compounds. A diagram with the relative location of Fermi levels and gaps for several oxides is presented. The procedure discussed here is generic, allowing for the qualitative prediction of the charge flow direction at several oxide interfaces. The addition of electrons to antiferromagnetic Cu oxides may lead to a superconducting state at the interface with minimal quenched disorder. %if the manganite used is not spin polarized. Model calculations using static and dynamical mean-field theory, supplemented by a Poisson equation formalism to address charge redistribution at the interface, support this view. The magnetic state of the manganites could be antiferromagnetic or ferromagnetic. The former is better to induce superconductivity than the latter, since the spin-polarized charge transfer will be detrimental to singlet superconductivity. It is concluded that in spite of the robust Hubbard gaps, the electron doping of undoped cuprates at interfaces appears possible, and its realization may open an exciting area of research in oxide heterostructures.},
doi = {10.1103/PhysRevB.76.064532},
journal = {Physical Review B},
number = 6,
volume = 76,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}