Nonequilibrium 1/f Noise in Low-doped Manganite Single Crystals

Autor:	Wu, X. D., Dolgin, B., Jung, G., Markovich, V., Yuzhelevski, Y., Belogolovskii, M., Mukovskii, Ya. M.
Rok vydání:	2007
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
DOI:	10.1063/1.2748083
Popis:	1/f noise in current biased La0.82Ca0.18MnO3 crystals has been investigated. The temperature dependence of the noise follows the resistivity changes with temperature suggesting that resistivity fluctuations constitute a fixed fraction of the total resistivity, independently of the dissipation mechanism and magnetic state of the system. The noise scales as a square of the current as expected for equilibrium resistivity fluctuations. However, at 77 K at bias exceeding some threshold, the noise intensity starts to decrease with increasing bias. The appearance of nonequilibrium noise is interpreted in terms of bias dependent multi-step indirect tunneling. Comment: 4pages, 3figures,APL accepted
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0705.3168 Zobrazit plný text záznamu View this record from Arxiv