hide
Free keywords:
high-T-c films; electronic transport phenomena in thin films; infrared and Raman spectra
Abstract:
We report a systematic study of the strain effect on thin films of
nonsuperconducting PrBa2Cu3O7-delta produced by pulsed laser
deposition. The transport properties and the Raman active modes are
studied for high-quality PrBa2Cu3O7-delta thin films grown on SrTiO3
(100) under a tensile strain, and under a compression strain on
LaSrAlO4 (001) substrate. The data show a lowering of the polaron
binding energy for the samples under compressive strain, as the film
thickness decreases. This can be directly concluded from the behavior
of the Raman active modes. These modes show a shift of the stretching
modes, shifted to lower wave number (cm(-1)) under the tensile strain,
and to higher wave number. under compressive strain. Our results are
analyzed in terms of the Fehrenbacher and Rice-model. (C) 2004 Elsevier
B.V. All rights reserved.
