INVESTIGADORES
STEREN Laura Beatriz
artículos
Título:
Direct observation of electronic inhomogeneities induced by point defects disorder in manganite films.
Autor/es:
M. SIRENA, A. ZIMMERS, N. HABERKORN, E. KAUL, L. B. STEREN, J. LESUEUR, Y. LE GALL AND J.-J. GROB.
Revista:
JOURNAL OF APPLIED PHYSICS
Editorial:
AMER INST PHYSICS
Referencias:
Año: 2010
ISSN:
0021-8979
Resumen:
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We have investigated the
influence of point defect disorder in the electronic inhomogeneities of
manganite films. Real-time mapping of ion irradiated samples conductivity was
performed though conductive atomic force microscopy (CAFM). CAFM images show
that the samples present conducting islands separated by insulator regions,
with a continuum distribution of conductivity values. This indicates that there
is not a clear phase separation in the system but rather inhomogeneous regions
with different physical properties due to fluctuations in the point defects
distribution. As disorder increases the saturation magnetization of the samples
decreases but the magnetic transition temperature remains unchanged. Transport
properties in these systems can be interpreted in terms of a percolative model.
As disorder increases, the distance between conducting regions increases and
the metal-insulator transition shifts to lower temperatures.
