title: Novel dynamical effects and persistent memory in phase separated manganites.
abstract: The time dependent response of the magnetic and transport properties of Fe-doped phase separated (PS) manganite La(0.5)Ca(0.5)MnO3 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, metalliclike 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.
authors.affiliation: Departamento de Física, Comisión Nacional de Energía Atómica, Gral Paz 1499 (1650) San Martín, Buenos Aires, Argentina.
authors.forename: P
authors.initials: P
authors.lastname: Levy
authors.forename: F
authors.initials: F
authors.lastname: Parisi
authors.forename: L
authors.initials: L
authors.lastname: Granja
authors.forename: E
authors.initials: E
authors.lastname: Indelicato
authors.forename: G
authors.initials: G
authors.lastname: Polla