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http://hdl.handle.net/10261/19045
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Campo DC | Valor | Lengua/Idioma |
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dc.contributor.author | Peña, Octavio | - |
dc.contributor.author | Antunes, A. B. | - |
dc.contributor.author | Martínez, G. | - |
dc.contributor.author | Gil, Vanesa | - |
dc.contributor.author | Moure Jiménez, Carlos | - |
dc.date.accessioned | 2009-11-26T10:02:07Z | - |
dc.date.available | 2009-11-26T10:02:07Z | - |
dc.date.issued | 2007 | - |
dc.identifier.citation | Journal of Magnetism and Magnetic Materials 310 (2007) 159–168 | en_US |
dc.identifier.uri | http://hdl.handle.net/10261/19045 | - |
dc.description.abstract | The gadolinium-based manganite GdMnO3 of perovskite structure has been partially substituted at the manganese site by transition metal elements Me like Cu, Ni and Co, leading to a general formula GdMexMn1 xO3, in which different magnetic entities (e.g., Gd3+, Cu2+, Ni2+, Co2+, Co3+, Mn3+, Mn4+) can coexist, depending on charge equilibrium conditions. For divalent cations such as Cu2+ and Ni2+, the solid solution extends from x(Me) ¼ 0–0.5, with O-type orthorhombic symmetry aoc= p 2ob . When the substituting element is cobalt, the solid solution extends over the whole range [0pxp1], changing from O0-type symmetry c= p 2oaob to O-type for x40.5. In this latter case, the synthesis is performed under oxygen flow, which allows the cobalt ion to take a 3+ oxidation state. Magnetic properties were studied through susceptibility and magnetization measurements. A paramagnetic–ferromagnetic transition occurs at Tc, due to double-exchange interactions between transition metal ions (Mn3+–Mn4+, Ni2+–Mn4+, Co2+–Mn4+), leading to an optimum value at x(Me) ¼ 0.50 (Tc ¼ 145 and 120 K, for GdNi0.5Mn0.5O3 and GdCo0.5Mn0.5O3, respectively). Different situations were identified, among them, a spin reversal in GdNi0.3Mn0.7O3, strong ferromagnetic interactions in GdNi0.5Mn0.5O3, large coercive fields in GdCo0.5Mn0.5O3 or Co3+–Mn4+ antiferromagnetic interactions in GdCo0.9Mn0.1O3. Most of these situations are explained by a phenomenological model of two magnetic sublattices: a transition-metal |Me+Mn| network which orders ferromagnetically at Tc and a gadolinium sublattice, composed of independent Gd3+ ions. These networks are antiferromagnetically coupled through a negative exchange interaction. The local field created by the ferromagnetic |Me+Mn| lattice at the gadolinium site polarizes the Gd moment in a direction opposite to the applied field. When the magnetization of paramagnetic gadolinium, which varies as T 1, gets larger than the ferromagnetic magnetization of the transition metal, which is ‘‘frozen’’ at ToTc, then the total magnetic moment changes its sign, leading to an overall ferrimagnetic state. | en_US |
dc.format.extent | 299855 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | closedAccess | en_US |
dc.title | Inter-network magnetic interactions in GdMexMn1 xO3 perovskites (Me ¼ transition metal) | en_US |
dc.type | artículo | en_US |
dc.identifier.doi | 10.1016/j.jmmm.2006.08.004 | - |
dc.description.peerreviewed | Peer reviewed | en_US |
dc.relation.publisherversion | http://dx.doi.org/doi:10.1016/j.jmmm.2006.08.004 | en_US |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.openairetype | artículo | - |
item.grantfulltext | none | - |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | No Fulltext | - |
item.languageiso639-1 | en | - |
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