Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.2: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Investigation of manganite/strontium titanate interfaces by surface photovoltage spectroscopy — •Elke Beyreuther¹, Stefan Grafström¹, Christian Thiele², Kathrin Dörr², and Lukas M. Eng¹ — ¹Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden — ²Institut für Metallische Werkstoffe, IFW Dresden, Postfach 270116, D-01171 Dresden

In the present study, we investigate the distribution of electronic interface states of three different perovskite oxide interfaces, formed by epitaxial thin films of La_0.7Sr_0.3MnO₃(LSMO), La_0.7Ca_0.3MnO₃(LCMO), and La_0.7Ce_0.3MnO₃(LCeMO) on SrTiO₃(100) substrates in the as-prepared state, as well as after an annealing procedure. We find that the annealing significantly reduced the number and density of interface trap states. Two different experimental techniques to comparatively inspect the surface photovoltage (SPV) spectra were employed: an approach based on X-ray photoelectron spectroscopy (XPS) and a capacitive approach. Advantages and limitations of both methods and their applicability to perovskite oxide interfaces are discussed critically.