Giant 1/f noise in perovskite manganites: evidence of the percolation threshold

Details Giant 1/f noise in perovskite manganites: evidence of the percolation threshold Giant 1/f noise in perovskite manganites: evidence of the percolation threshold

1999-10-14

arxiv.org/abs/cond-mat/9910220v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.61.R3784

We discovered an unprecedented magnitude of the 1/f noise near the Curie temperature Tc in low-Tc manganites. The scaling behavior of the 1/f noise and the resistance provides strong evidence of the percolation nature of the ferromagnetic transition in the polycrystalline samples. The step-like changes of the resistance with temperature, observed for single crystals, suggest that the size of the ferromagnetic domains depends on the size of crystallites.

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