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|Title:||Field-induced crossover from cluster-glass to ferromagnetic state in La₀.₇Sr₀.₃Mn₀.₇Co₀.₃O₃|
Fan, X. J.
Ku, H. C.
Exchange interactions (electron)
|Publisher:||American Institute of Physics|
|Source:||Journal of applied physics, 1 Feb. 1999, v. 85, no. 3, p. 1663-1666.|
|Abstract:||The thermodynamics and kinetics of the magnetic states of the semiconductor-like compound La₀.₇Sr₀.₃Mn₀.₇Co₀.₃O₃were studied by detailed magnetic measurements. The spontaneous magnetic state was found to be a cluster-glass phase which can cross over to a ferromagnetic state under an external magnetic field H. The defreezing temperature T[sub f] for the cluster-glass phase and the merging temperature T[sub m] for zero field cooled and field cooled magnetizations are related to the field H by H[sub j]=H[sub 0j](1-T[sub j]/T[sub c])[sup nj], where H[sub 0j] and n[sub j] are constants and j=f,m. Codoping tends to destroy the double exchange in Mn⁴⁺–O–Mn³⁺ and broadens the coexistence region of the cluster-glass and ferromagnetic states. The magnetic relaxation was found to deviate from the usual logarithmic time dependence and follow a power law.|
|Rights:||© 1999 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in X. G. Li et al., J. Appl. Phys. 85, 1663 (1999) and may be found at http://link.aip.org/link/?jap/85/1663.|
|Appears in Collections:||AP Journal/Magazine Articles|
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