Competition between covalent bonding and charge transfer at complex-oxide interfaces

Juan Salafranca, Julián Rincón, Javier Tornos, Carlos León, Jacobo Santamaria, Elbio Dagotto, Stephen J. Pennycook, Maria Varela

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Here we study the electronic properties of cuprate-manganite interfaces. By means of atomic resolution electron microscopy and spectroscopy, we produce a subnanometer scale map of the transition metal oxidation state profile across the interface between the high Tc superconductor YBa2Cu3O7-δ and the colossal magnetoresistance compound (La,Ca)MnO3. A net transfer of electrons from manganite to cuprate with a peculiar nonmonotonic charge profile is observed. Model calculations rationalize the profile in terms of the competition between standard charge transfer tendencies (due to band mismatch), strong chemical bonding effects across the interface, and Cu substitution into the Mn lattice, with different characteristic length scales.

Original languageEnglish (US)
Article number196802
JournalPhysical Review Letters
Volume112
Issue number19
DOIs
StatePublished - May 14 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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