Giant 1/f noise in perovskite manganites: evidence of the percolation threshold
arXiv:cond-mat/9910220 · doi:10.1103/PhysRevB.61.R3784
Abstract
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.
4 pages, 3 figures