Berlin 2012 – wissenschaftliches Programm
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MI: Fachverband Mikrosonden
MI 4: 100 years since the Laue experiment: Topical aspects of diffraction and scattering (Joint Session KR, BP, DF, GP, MA, MI, MM; related to SYXD)
MI 4.11: Vortrag
Dienstag, 27. März 2012, 12:30–12:45, EMH 225
Reconstruction phenomena at the interfaces of LaCoO3 single films: A resonant x-ray reflectivity study — •Jorge E. Hamann-Borrero1,2, Abdullah Radi2, Woo Seok Choi3, Sebastian Macke4, Ronny Sutarto5, Feizhou He5, George A. Sawatzky2, Ho Nyung Lee3, and Vladimir Hinkov4 — 1IFW-Dresden — 2University of British Columbia, Vancouver, Canada — 3Oak Ridge National Laboratory, Materials Science and Technology Division, USA. — 4Max Planck-UBC Centre for Quantum Materials, Vancouver, Canada — 5Canadian Light Source, Saskatoon, Canada
A series of LaCoO3 (LCO) single films grown on polar NdGaO3 (NGO) and non polar SrTiO3 (STO) substrates were studied by means of Resonant Soft X-ray Reflectivity (RXRR) and X-ray Absorption Spectroscopy (XAS).
The RXRR measurements were performed at photon energies close to the Co L2,3 edges.
The detailed analysis of the energy dependent measurements at fixed Q values corresponding to maxima and minima of the RXRR Kiessig fringes
reveals a strong signal contribution to the line-shapes which can not be attributed to pure Co3+.
By considering the polar nature of the LCO structure we find that, at interfaces with polar discontinuity, e.g., at LCO/STO and LCO/Vaccum, reconstruction phenomena take place.
The work at Oak Rigde National Laboratory was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division.