Interfacial electronic states between LaMnO3 and SrMnO3 have been studied by second-harmonic (SH) spectroscopy. The SH contributions from bulk, surface, and interface were separated by measuring four distinct types of manganite thin films. In the SH spectra, we found a broad peak at 2eV unique to the LaMnO3 SrMnO3 interface, which was assigned to interfacial charge transfer excitation based on a Hartree-Fock calculation. No metallic phase showed up at the interface. Experimental and theoretical second-order susceptibilities χ(2) at the interface were estimated to be ∼10-6esu, which is ten times as large as the highest χ(2) value of BaTiO3.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2005 Dec 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics