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Abstract:
The discovery of the colossal magnetoresistance and pressure
effects introduced new questions concerning the complex
interplay among lattice structure, magnetism, and transport in
doped perovskite manganites. To observe the interplay between
the effect of pressure and strain due to the substrate in the
La2/3Ca1/3MnO3 compound, we produced epitaxial films with the
thickness varied between 20 and 100 nm on SrTiO3 substrates,
using the pulse laser deposition technique and under the same
epitaxial growth conditions. We measured magnetic transition
temperature T-C and resistivity rho, as a function of pressure
up to 8 kbar. Using these results, the dependence of bond
compression on pressure, and the lattice distortion induced by
the substrate, are discussed. We also report a universal
behavior from the plot of d ln T-C/dP and drho/dP versus T-C
for these films, as well as previously published results on
ceramic and thin films of this compound. (C) 2002 American
Institute of Physics.
