We study the structural, magnetic, and transport properties of LaAlO3/EuTiO3/SrTiO3 heterostructures grown by pulsed laser deposition. The samples are characterized in situ by electron diffraction and scanning probe microscopy 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 greater than or equal to four unit cells. The effect of ferromagnetic EuTiO3 on the transport properties of delta-doped LaAlO3/EuTiO3/SrTiO3 is critically discussed.
Transport properties of a quasi-two-dimensional electron system formed in LaAlO3 / EuTiO3 / SrTiO3 heterostructures / DE LUCA, G.M., DI CAPUA, R., DI GENNARO, E., Granozio, F.M., Stornaiuolo, D., Salluzzo, M., Gadaleta, A., Pallecchi, I., Marrè, D., Piamonteze, C., Radovic, M., Ristic, Z., Rusponi, S.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 89:22(2014), pp. 224413-1-224413-6. [10.1103/PhysRevB.89.224413]
Transport properties of a quasi-two-dimensional electron system formed in LaAlO3 / EuTiO3 / SrTiO3 heterostructures
DE LUCA, GABRIELLA MARIA;DI CAPUA, ROBERTO;DI GENNARO, EMILIANO;STORNAIUOLO, DANIELA;
2014
Abstract
We study the structural, magnetic, and transport properties of LaAlO3/EuTiO3/SrTiO3 heterostructures grown by pulsed laser deposition. The samples are characterized in situ by electron diffraction and scanning probe microscopy 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 greater than or equal to four unit cells. The effect of ferromagnetic EuTiO3 on the transport properties of delta-doped LaAlO3/EuTiO3/SrTiO3 is critically discussed.| File | Dimensione | Formato | |
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