Magnetic and Transport Properties of La$_{0.7}$Sr$_{0.3}$Co$_{1-y}$Mn$_y$O$_3$

Simple item page
dc.creatorNam, D. N. H.
dc.creatorBau, L. V.
dc.creatorKhiem, N. V.
dc.creatorSon, L. H.
dc.creatorPhuc, N. X.
dc.date2002-07-16
dc.date.accessioned2026-07-07T02:46:17Z
dc.date.available2026-07-07T02:46:17Z
dc.descriptionWhile both La$_{0.7}$Sr$_{0.3}$MnO$_3$ and La$_{0.7}$Sr$_{0.3}$CoO$_3$ are ferromagnets with metallic conductivity below $T_\mathrm{c}$ (360K and 220K, respectively), partial substitutions of Co by Mn in La$_{0.7}$Sr$_{0.3}$Co$_{1-y}$Mn$_y$O$_3$ ($y < 0.1$) drastically suppress the ferromagnetic long-range order pre-established by Co-O-Co double exchange and tune the conductivity towards insulating behavior. Since Mn-O-Mn double-exchange interactions are avoidable at low Mn-substitution levels, the deterioration of ferromagnetism and conductivity thus provides evidence for no Mn-O-Co double exchange (but antiferromagnetic superexchange) in the present system. At $y = 0.1$, the ferromagnetism is no longer observed; the system becomes an insulating spin-glass with $T_\mathrm{g}\approx 62$K as estimated from the ac-susceptibility data using the conventional critical slowing-down scaling law. With further substitution ($y\geq 0.3$), the ferromagnetism is recovered ($T_\mathrm{c} = 165$K for $y = 0.3$ and 200K for $y = 0.5$) while the resistivity continues increasing and exhibits insulating behavior. These results indicate that the substitution is not simply a mixture of La$_{0.7}$Sr$_{0.3}$MnO$_3$ and La$_{0.7}$Sr$_{0.3}$CoO$_3$, but produces a more complicated scenario of spin states, interactions and disorder.
dc.descriptionRevTeX4, 5 pages, 4 figures, unpublished
dc.identifierhttps://arxiv.org/abs/cond-mat/0207380
dc.identifierhttp://arxiv.org/abs/cond-mat/0207380
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/19612
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleMagnetic and Transport Properties of La$_{0.7}$Sr$_{0.3}$Co$_{1-y}$Mn$_y$O$_3$
dc.typetext

Files

Collections

arXiv