INVESTIGADORES
HABERKORN Nestor Fabian
artículos
Título:
Metal-insulator transition induced by postdeposition annealing in low doped manganite films
Autor/es:
M. SIRENA; N. HABERKORN; M. GRANADA; L. B. STEREN; J. GUIMPEL
Revista:
JOURNAL OF APPLIED PHYSICS
Editorial:
American Institute of Physics.
Referencias:
Año: 2009 vol. 105 p. 33902 - 33905
ISSN:
0021-8979
Resumen:
We studied the transport and magnetic properties of low-doped manganite films after different
oxygenation processes. The oxygen content was adjusted by postdeposition annealing at different
oxygen pressures and annealing times. For all the samples we observed an increase in the Curie
temperature and the remnant magnetization with the oxygen content. In general, for decreasing
number of oxygen vacancies, samples under expansive strain become more homogeneous and their
electrical resistivity decreases. A metal-insulator transition is induced in highly oxygenated films
grown on SrTiO3, probably related to a shift of the mobility edge crossing below the Fermi energy.
We found that the oxygenation dynamics depend critically on the strain field induced by the
substrates and also on the Sr doping concentration.
We found that the oxygenation dynamics depend critically on the strain field induced by the
substrates and also on the Sr doping concentration.
3, probably related to a shift of the mobility edge crossing below the Fermi energy.
We found that the oxygenation dynamics depend critically on the strain field induced by the
substrates and also on the Sr doping concentration.