H.-U. Habermeier

Cuprate/manganite superlattices. A model system for a bulk ferromagnetic superconductor

Abstract YBa 2 Cu 3 O 7 /La 0.67 Ca 0.33 MnO 3 superlattices (SLs) and heterostructures have been grown by pulsed laser deposition with individual layer thickness ranging from 4 to 200 unit cells for the YBa 2 Cu 3 O 7 and 10–500 unit cells for the La 0.67 Ca 0.33 MnO 3 . Whereas simple heterostructures (single layer La 0.67 Ca 0.33 MnO 3 and single layer YBa 2 Cu 3 O 7 50 nm thickness each) reproduce the intrinsic properties of the constituent material rather well with reduced critical temperatures for the phase transitions (Curie temperature 250 K, superconducting transition at T =70 K) the critical temperatures systematically vary with the SL composition due to coupling between the layers observed in the SLs. This systematic rules out a simple decoupling of the individual layers. Tentatively we ascribe the composition dependent changes of the critical temperatures to interaction effects at the electronic level.

Ferromagnetic/superconducting bilayer structure: A model system for spin diffusion length estimation

We report detailed studies on ferromagnet--superconductor bilayer structures. Epitaxial bilayer structures of half metal--colossal magnetoresistive La

Extraordinary Hall effect in magnetic films

_{mathrm{2/3}}

Thickness dependence of microstructure in LaCaMnO thin films

Ca

A study of the domain structure of epitaxial La1-xCaxMnO3 films by high-resolution transmission electron microscopy

_{mathrm{1/3}}

Effects of pressure on the superconducting properties of magnesium diboride

MnO

The enhancement of flux-line pinning in all-oxide superconductor/ferromagnet heterostructures

_{mathrm{3}}

Laser induced voltage in CMR thin films and its device application

(HM--CMR) and high--

Spin-wave scattering at low temperatures in manganite films

T_{mathrm{c}}

Physics and application potential of epitaxial strain in doped rare earth manganites

superconducting YBa