Growth and characterization of conducting LaAlO3/EuTiO3/SrTiO3 het-erostructures
cond-mat.mtrl-sci
/ Authors
G. M. De Luca, R. Di Capua, E. Di Gennaro, F. Miletto Granozio, M. Salluzzo, A. Gadaleta, I. Pallecchi, D. Marrè, C. Piamonteze, M. Radovic
and 2 more authors
/ Abstract
We studied the structural, magnetic and transport properties of LaAlO3/EuTiO3/SrTiO3 heterostructures grown by Pulsed Laser Deposition. The samples have been characterized in-situ by electron diffraction and scanning probe mi-croscopy and ex-situ by transport measurements and x-ray absorption spectroscopy. LaAlO3/EuTiO3/SrTiO3 films show a ferromagnetic transition at T<7.5 K, related to the ordering of Eu2+ spins, even in samples characterized by just two EuTiO3 unit cells. A finite metallic conductivity is observed only in the case of samples composed by one or two EuTiO3 unit cells and, simultaneously, by a LaAlO3 thickness equal or above 4 unit cells. The role of ferromagnetic EuTiO3 on the transport properties of delta-doped LaAlO3/EuTiO3/SrTiO3 is critically discussed.