Issue Europhys. Lett. Volume 55, Number 3, August 2001 Page(s) 411 - 417 Section Condensed matter: electronic structure, electrical, magnetic, and optical properties DOI 10.1209/epl/i2001-00429-5

DOI: 10.1209/epl/i2001-00429-5


Europhys. Lett., 55 (3) , pp. 411-417 (2001)

Mesoscopic, non-equilibrium fluctuations of inhomogeneous electronic states in manganites

V. Podzorov¹, C. H. Chen², M. E. Gershenson¹ and S.-W. Cheong<sup>1, 2

1</sup>  Serin Physics Laboratory, Rutgers University - Piscataway, NJ 08854, USA
²  Bell Laboratories, Lucent Technologies - Murray Hill, NJ 07974, USA

(Received 15 January 2001; accepted 17 May 2001)

Abstract
By using the dark-field real-space imaging technique of transmission electron microscopy (TEM), we have observed slow 200 scale fluctuations of charge-ordered (CO) phase in mixed-valent manganites under a strong electron beam irradiation. In addition to these unusual fluctuations of the CO phase, we observed switching-type fluctuations of electrical resistivity in the same sample, which were found to be as large as several percents. Systematic analysis indicates that these two different types of fluctuations with a similar time scale of the order of seconds are interconnected through a metastable insulating charge-disordered state. Current dependence of the fluctuations suggests a non-equilibrium nature of this slow dynamics.

PACS
75.30.Vn - Colossal magnetoresistance.
68.37.Lp - Transmission electron microscopy (TEM) (including STEM, HRTEM, etc.).
74.40.+k - Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.).


© EDP Sciences 2001

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