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Type: Artigo de periódico
Title: Crystal Structures And Magnetic Order Of La0.5+δa 0.5-δmn0.5+εru0.5-εo 3 (a = Ca, Sr, Ba): Possible Orbital Glass Ferromagnetic State
Author: Granado E.
Huang Q.
Lynn J.W.
Gopalakrishnan J.
Ramesha K.
Abstract: The crystallographic and magnetic properties of La 0.5+δA0.5-δMn0.5+εRu 0.5-εO3 (A = Ca, Sr, Ba) were investigated by means of neutron powder diffraction. All studied samples show the orthorhombic perovskite crystal structure, space group Pnma, with regular (Mn, Ru)O 6 octahedra and no chemical ordering of the Mn3+ and Ru4+ ions. Ferromagnetic spin structures were observed below T c∼200-250 K, with an average ordered moment of ∼1.8-2.0 μB/(Mn, Ru). The observation of long-range ferromagnetism and the absence of orbital ordering are rationalized in terms of a strong Mn-Ru hybridization, which may freeze the orbital degree of freedom and broaden the eg valence band, leading to an orbital glass state with carrier-mediated ferromagnetism.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.70.214416
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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