Noise probe of the dynamic phase separation in La2/3Ca1/3MnO3

Citation
B. Raquet et al., Noise probe of the dynamic phase separation in La2/3Ca1/3MnO3, PHYS REV L, 84(19), 2000, pp. 4485-4488
Citations number
31
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
84
Issue
19
Year of publication
2000
Pages
4485 - 4488
Database
ISI
SICI code
0031-9007(20000508)84:19<4485:NPOTDP>2.0.ZU;2-S
Abstract
Giant random telegraph noise (RTN) in the resistance fluctuation of a macro scopic film of perovskite-type manganese oxide La2/3Ca1/3MnO3 has been obse rved at various temperatures ranging from 4 to 170 K, well below the Curie temperature (T-C approximate to 210 K). The amplitudes of the two-level flu ctuations vary from 0.01% to 0.2%. We discuss the origin of the RTN to be a dynamic mixed-phase percolative conduction process, where manganese cluste rs switch back and forth between two phases that differ in their conductivi ty and magnetization.