| Issue |
Europhys. Lett.
Volume 55, Number 3, August 2001
|
|
|---|---|---|
| Page(s) | 411 - 417 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00429-5 | |
| Published online | 01 December 2003 | |
Mesoscopic, non-equilibrium fluctuations of inhomogeneous electronic states in manganites
1
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
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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