Dilution of 2D antiferromagnetism by Mn site substitution in La{_1}Sr{_2}Mn{_{2-x}}Al{_x}O{_7}

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dc.creatorNair, Sunil
dc.creatorBanerjee, A.
dc.date2003-12-08
dc.date.accessioned2026-07-07T02:55:16Z
dc.date.available2026-07-07T02:55:16Z
dc.descriptionWe report the effect of Al substitution on the Mn site of the bilayered half doped manganite La{_1}Sr{_2}Mn{_2}O{_7}. This substitution dilutes the magnetically active Mn-O-Mn network without introducing an appreciable distortion in the lattice and ionic considerations leads to a predominant reduction of Mn{^{4+}} with increasing Al. The rate of fall of the long range antiferromagnetic transition temperature as a function of substitution is seen to match well with established quasi 2D Heisenberg systems indicating that the nature of magnetic interactions in this quasi 2-D system is of the short range Heisenberg type. The magnetic contribution of the specific heat estimated using Fisher's relation could be fitted with a function incorporating the presence of a gapped Fermi surface appropriate for this type of systems. The resistivity was seen to increase as a function of substitution due to the weakening of the double exchange within the ferromagnetic layers of these A type of antiferromagnets and justifiably, in the paramagnetic region the data could be fitted to Mott's equation for the variable range hopping of polarons in 2 dimensions.
dc.description5 post script figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0312193
dc.identifierhttp://arxiv.org/abs/cond-mat/0312193
dc.identifierPhys. RevB. 70, 104428 (2004)
dc.identifierdoi:10.1103/PhysRevB.70.104428
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22876
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleDilution of 2D antiferromagnetism by Mn site substitution in La{_1}Sr{_2}Mn{_{2-x}}Al{_x}O{_7}
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