Effects of dilution on magnetic and transport properties of La0.7Ca0.3Mn1-xM'xO3

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dc.creatorNam, D. N. H.
dc.creatorHong, H. S.
dc.creatorKhien, N. V.
dc.creatorDai, N. V.
dc.creatorThanh, T. D.
dc.creatorTuong, L. T. C.
dc.creatorHong, L. V.
dc.creatorPhuc, N. X.
dc.date2008-04-14
dc.date.accessioned2026-07-07T09:32:12Z
dc.date.available2026-07-07T09:32:12Z
dc.descriptionMagnetic and transport properties of La0.7Ca0.3Mn1-xM'xO3 (M'=Al,Ti) are studied. The dilution of the Mn lattice results in a weakening of the ferromagnetism, a deterioration of the metallic conductivity, and a strong enhancement of the magnetoresistance. Although Tc linearly decreases with x in the low substitution ranges for both M' series, the scaling behavior Tc(np) previously observed for La0.7Sr0.3Mn1-xM'xO3 [Phys. Rev. B 73, 184403 (2006)] is no longer obtained. Extrapolations of the Tc(np) linear curves to Tc=0 give np values much smaller than 1. These results suggest that, according to a molecular-field approximation, antiferromagnetic superexchange between Mn ions is significant in La0.7Ca0.3MnO3, in contrast to what observed in La0.7Sr0.3MnO3. Additionally, structural data of the Al-substituted samples suggest that variations of the eg-electron bandwidth W cannot explain the decrease of Tc in magnetically diluted manganites.
dc.descriptionRevtex 4, 5 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/0804.2101
dc.identifierhttp://arxiv.org/abs/0804.2101
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/158728
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleEffects of dilution on magnetic and transport properties of La0.7Ca0.3Mn1-xM'xO3
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