Electron Doping of Cuprates via Interfaces with Manganites

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.76.064532· OSTI ID:978749

Yunoki, Seiji ^[1]; Moreo, Adriana ^[1]; Dagotto, Elbio R ^[1]; Okamoto, Satoshi ^[1]; Kancharla, Srivenkateswara S ^[1]; Fujimori, A ^[2]

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1. ORNL
2. University of Tokyo, Tokyo, Japan

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.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 978749
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 76; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CMR manganites
CUPRATES
DIFFUSION
ELECTRONS
FERMI LEVEL
FORECASTING
MEAN-FIELD THEORY
OXIDES
PHOTOEMISSION
POISSON EQUATION
SUPERCONDUCTIVITY
correlated-electron heterostructures
high-Tc superconductivity