Amorphous LaAlO3/SrTiO3 interfaces exhibit metallic conductivity similarto those found for the extensively studied crystalline-LaAlO3/SrTiO3 interfaces. Here, we investigate the conductivity of the amorphous-LaAlO3/SrTiO3 interfaces grown in different pressures of O2 and Ar background gases. During the deposition, the LaAlO3 ablation plume is also studied, in situ, by fast photography and space-resolved optical emission spectroscopy. An interesting correlation between interfacial conductivity and kinetic energy of the Al atoms in the plume is observed: to assure conducting interfaces of amorphous-LaAlO3/SrTiO3, the kinetic energy of Al should be higher than 1 eV. Our findings add further insights on mechanisms leading to interfacial conductivity in SrTiO3-based oxide heterostructures.
Plasma plume effects on the conductivity of amorphous LaAlO3/SrTiO3 interfaces grown by pulsed laser deposition in O2 and Ar / Sambri, Alessia; D. V., Cristensen; F., Trier; Y. Z., Chen; Amoruso, Salvatore; N., Pryds; Bruzzese, Riccardo; X., Wang. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 100:23(2012), pp. 231605-1-231605-4. [10.1063/1.4727905]
Plasma plume effects on the conductivity of amorphous LaAlO3/SrTiO3 interfaces grown by pulsed laser deposition in O2 and Ar
SAMBRI, ALESSIA;AMORUSO, SALVATORE;BRUZZESE, RICCARDO;
2012
Abstract
Amorphous LaAlO3/SrTiO3 interfaces exhibit metallic conductivity similarto those found for the extensively studied crystalline-LaAlO3/SrTiO3 interfaces. Here, we investigate the conductivity of the amorphous-LaAlO3/SrTiO3 interfaces grown in different pressures of O2 and Ar background gases. During the deposition, the LaAlO3 ablation plume is also studied, in situ, by fast photography and space-resolved optical emission spectroscopy. An interesting correlation between interfacial conductivity and kinetic energy of the Al atoms in the plume is observed: to assure conducting interfaces of amorphous-LaAlO3/SrTiO3, the kinetic energy of Al should be higher than 1 eV. Our findings add further insights on mechanisms leading to interfacial conductivity in SrTiO3-based oxide heterostructures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
