Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 48: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Vortices

TT 48.2: Talk

Friday, March 30, 2012, 09:45–10:00, H 2053

Transport, magnetic and structural properties of YBa₂Cu₃O₇/La_0.7Ca_0.3MnO₃ heterostructures grown on SrTiO3 (110) substrates — •Luqman Mustafa¹, Soltan Soltan^1,2, Gennady Logvenov¹, Hanns-Ulrich Habermeier¹, and Bernhard Keimer¹ — ¹Max Planck Institute or Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany — ²Physics Department, Faculty of science, Helwan University, 11792-Helwan, Cairo, Egypt

YBCO/LCMO bi- and multi-layers were grown on STO (110) substrates by Pulsed Laser Deposition (PLD) technique with the goal to study the interface of an oxide ferromagnet and a cuprate superconductor where the CuO₂ planes are perpendicular to the film plane. The structure was investigated by X-ray diffractometry, transport and magnetic properties were studied by conventional four-point-probe and SQUID techniques respectively.

Depending on the preparation conditions the single layer YBCO as well as bilayers can be grown in the (110), (103)/(10-3), as well as mixed orientations. Large anisotropy of electrical conductivity in these films was observed in case of (110)-oriented YBCO layer and less pronounced anisotropy in case of (103)-oriented one. We present a detailed analysis of the anisotropy of the magnetization of such bi- and multi-layers emphasizing its relation to the orientation of the YBCO film.