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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 20.50: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Transport properties of epitaxially grown thin Pr_0,68Ca_0,32MnO₃ film on vicinal SrTiO₃ substrates — •Peter Moschkau, Sebastian Schramm, and Christian Jooss — Institut für Materialphysik, Universität Göttingen

In order to investigate mechanisms and length scales for the insulator metal transition and a possible formation of phase separation in PCMO films, defect structures are tailord via growth on vicinal SrTiO₃ substrates. The films are epitaxially grown by pulsed laser deposition and are c-axis oriented. The characteristic structural properties are analysed by x-ray diffraction, scanning electron microscopy and atomic force microscopy. We find a transition from island growth mode to step-flow growth mode for vicinal substrate with tilt angles between 3 and 10 degree. The lattice strain is strongly increased with increasing tilt angle of the substrates. Transport measurements in applied external field show an Insulator-Metal (IM) transition with huge resistivity changes of several orders of magnitudes. A significant change of the IM transition is observed on vicinal substrates with tilt angles larger than 3 degree. An important observation is the change of the electronic-history dependence of the IM transition in films on vicinal substrates. We discuss the relation between structure and electronic properties for the films as a function of tilt angle.