Publication: Competition between covalent bonding and charge transfer at complex-oxide interfaces
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2014-05-14
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Salafranca, Juan
Rincón, Julián
Dagotto, Elbio
Pennycook, Stephen J.
Varela del Arco, María
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American Physical Society
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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 YBa_(2)Cu_(3)O_(7−δ) and the colossal magnetoresistance compound (La,Ca)MnO_(3). 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.
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© 2014 American Physical Society. The authors thank Luis Brey for helpful discussions and Masashi Watanabe for the principal component analysis plug-in for Digital Micrograph. Research at ORNL (S. J. P., M. V., E. D., and J. R.) was supported by the U.S. Department of Energy (DOE), Basic Energy Sciences (BES), Materials Sciences and Engineering Division, and through the Center for Nanophase Materials Sciences (CNMS), which is sponsored by the Scientific User Facilities Division, DOE-BES. J.Sal. was supported by the ERC starting Investigator Award, Grant No. 239739 STEMOX and Juan de la Cierva program JCI-2011-09428 (MICINN-Spain). Research at UCM (J.T., C.L., J.San.) was supported by the Spanish MICINN/MINECO through Grants No. MAT2011-27470-C02 and Consolider Ingenio 2010 -CSD2009-00013 (Imagine), and by CAM through Grant No. S2009/MAT-1756 (PHAMA). Computations were supported by the National Center for Supercomputing Applications (U.S. Department of Energy, Contract No. DEAC02-05CH11231).
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