Mesoscopic thermodynamics of an inhomogeneous colossal-magnetoresistive phase

Citation
Rd. Merithew et al., Mesoscopic thermodynamics of an inhomogeneous colossal-magnetoresistive phase, PHYS REV L, 84(15), 2000, pp. 3442-3445
Citations number
12
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
84
Issue
15
Year of publication
2000
Pages
3442 - 3445
Database
ISI
SICI code
0031-9007(20000410)84:15<3442:MTOAIC>2.0.ZU;2-G
Abstract
Equilibrium conductivity fluctuations of mesoscopic domains are found in fi lm and bulk single-crystal manganite colossal magnetoresistive material. Te mperature and field dependences of the Boltzmann factors for a collection o f two-state fluctuators give measures of the magnetic moment and entropy di fferences between the states, and of the fluctuator volumes. The large resi stance step size implies dramatic current inhomogeneities. Occasional anoma lous temperature dependences indicate that the film inhomogeneous phase is stabilized by a repulsive interaction between conducting regions.