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Novel dynamical effects and persistent memory in phase separated manganites.

P Levy¹, F Parisi, L Granja

¹Departamento de Física, Comisión Nacional de Energía Atómica, Gral Paz 1499 (1650) San Martín, Buenos Aires, Argentina.

Physical Review Letters

|September 13, 2002

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The study reveals slow dynamics in phase-separated manganites, affecting magnetic and transport properties. This leads to unusual resistivity behavior and memory effects in magnetic fields.

Area of Science:

Condensed Matter Physics
Materials Science
Magnetism

Background:

Phase-separated manganites exhibit complex magnetic and transport behaviors due to the coexistence of different phases.
La(0.5)Ca(0.5)MnO3 is a prototypical manganite known for its rich phase diagram and potential applications.

Purpose of the Study:

To investigate the time-dependent response of magnetic and transport properties in Fe-doped La(0.5)Ca(0.5)MnO3.
To understand the influence of slow dynamics arising from phase separation on material properties.
To identify novel phenomena related to aging and memory effects in these materials.

Main Methods:

Time-resolved measurements of magnetic and transport properties.
Analysis of resistivity and magnetization as a function of time and temperature.

Related Experiment Videos

Investigating the impact of cooling rates and magnetic field history.

Main Results:

Observed slow dynamics, time relaxation, and cooling rate dependence in the phase-separated regime.
Metallic-like behavior observed before ferromagnetic percolation due to dynamical contributions.
Reported rejuvenation of resistivity after aging and persistent memory of low magnetic fields.

Conclusions:

The coexistence of ferromagnetic and non-ferromagnetic regions significantly impacts the dynamics and properties of manganites.
Dynamical contributions can mimic percolation effects in transport properties.
Novel rejuvenation and memory effects highlight the complex nature of phase-separated manganites.