Abstract
We report here a study on the environmental dependence of the occurrence, at lowtemperature, of ultra-sharp field induced avalanches in phase separated manganites.Despite the high reproducibility of avalanches, it has already been observed that the criticalfields shift with the magnetic field sweep rate and that different sample sizes lead todifferent ignition fields for the avalanches. Critical growing rates have been suggested todescribe the avalanche ignition though the role of thermal coupling has hardly beenconsidered. We qualitatively analyze here a set of experimental data on avalanches inmanganites and discuss the role of thermal coupling as a key parameter of the instability ina dynamical system.
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