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artículo con referato
"Novel Dynamical Effects and Persistent Memory in Phase Separated Manganites"
P. Levy, F. Parisi, L. Granja, E. Indelicato and G. Polla
Phys. Rev. Lett. 89(13) (2002) 137001/1-4
The time dependent response of the magnetic and transport properties of Fe-doped phase separated (PS) manganite La0.5Ca0.5MnO3 is reported. The nontrivial coexistence of ferromagnetic (FM) and non-FM regions induces a slow dynamics which leads to time relaxation and cooling rate dependence within the PS regime. This dynamics influences physical properties drastically. On one hand, metallic-like behavior, assumed to be a fingerprint of percolation, can be also observed before the FM phase percolates as a result of dynamical contributions. On the other hand, two novel effects for the manganites are reported, namely, the rejuvenation of the resistivity after aging and a persistent memory of low magnetic fields ( < 1 T), imprinted in the amount of the FM phase.
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