An electron paramagnetic resonance and magnetically modulated microwave absorption characterization of thermochromic (Ba, Li)-Mn oxides

G. Alvarez, R. Zamorano, J. Heiras, M. Castellanos, R. Valenzuela

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13 Citas (Scopus)

Resumen

We report electron paramagnetic resonance (EPR) and magnetically modulated microwave absorption spectroscopy (MAMMAS) studies on powdered BaMnO3 and Li2MnO3 in the 77-300 K temperature range. The two oxides showed one single-line EPR spectra at room temperature. For Li2MnO3 the absorption line changed continuously with temperature, and showed a paramagnetic behavior in the whole temperature range. For BaMnO3 an additional signal was observed below ∼196 K; at low temperature (<135 K) the original signal has practically vanished. The changes in the g-factor, peak-to-peak linewidth (ΔHpp) and integrated intensity (IEPR) as a function of temperature are studied. The MAMMAS spectrum for Li2Mn03 showed a monotonic increase with temperature; this result confirmed its paramagnetic behavior. For BaMnO3 the MAMMAS signal exhibited a maximum at Tmax=139 K, approximately the temperature for the color change.

Idioma originalInglés
Páginas (desde-hasta)e695-e698
PublicaciónJournal of Magnetism and Magnetic Materials
Volumen316
N.º2 SPEC. ISS.
DOI
EstadoPublicada - sep. 2007

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