Role of defects on the magnetic behaviour of the geometrically frustrated spinel ZnFe2O4

Defective zinc ferrites ZnFe2O4-δ obtained by vacuum annealing bulk Zn-ferrite at different temperatures TAnn were investigated by using XANES at Zn-K, Fe-K and XMCD at Fe-L2,3 edges, static and dynamic magnetic measurements. The cation inversion that confers to the starting ferrite a weak ferromagn...

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Detalles Bibliográficos
Autores principales:	Salcedo Rodríguez, Karen Lizeth, Stewart, Silvana Jacqueline, Mendoza Zélis, Pedro, Pasquevich, Gustavo Alberto, Rodríguez Torres, Claudia Elena
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2018
Materias:	Física Zinc ferrite Pyrochlore Geometrically frustrated spinel Cluster glass
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/96885 https://ri.conicet.gov.ar/11336/87528
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-96885
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Física Zinc ferrite Pyrochlore Geometrically frustrated spinel Cluster glass
spellingShingle	Física Zinc ferrite Pyrochlore Geometrically frustrated spinel Cluster glass Salcedo Rodríguez, Karen Lizeth Stewart, Silvana Jacqueline Mendoza Zélis, Pedro Pasquevich, Gustavo Alberto Rodríguez Torres, Claudia Elena Role of defects on the magnetic behaviour of the geometrically frustrated spinel ZnFe2O4
topic_facet	Física Zinc ferrite Pyrochlore Geometrically frustrated spinel Cluster glass
description	Defective zinc ferrites ZnFe2O4-δ obtained by vacuum annealing bulk Zn-ferrite at different temperatures TAnn were investigated by using XANES at Zn-K, Fe-K and XMCD at Fe-L2,3 edges, static and dynamic magnetic measurements. The cation inversion that confers to the starting ferrite a weak ferromagnetic response is progressively lost when TAnn surpasses 250 °C. Consequently, there is a detriment of the magnetic response that reaches its lower value for TAnn around 370 °C, being the latter coincident with a negligible non-equilibrium occupancy. Above TAnñ 450 °C the ferrite progressively enhances its magnetic response. In such case, even though Zn and Fe occupy non-equilibrium sites at surface regions, the deficiency of oxygen predominates over inversion and the former triggers an increment of the magnetic coupling between Fe3+ at octahedral spinel sites. We discuss the magnetic results that account for spin-glass and/or cluster-glass behavior of this geometrically frustrated compound as due to the randomness and frustration introduced by local defects.
format	Articulo Preprint
author	Salcedo Rodríguez, Karen Lizeth Stewart, Silvana Jacqueline Mendoza Zélis, Pedro Pasquevich, Gustavo Alberto Rodríguez Torres, Claudia Elena
author_facet	Salcedo Rodríguez, Karen Lizeth Stewart, Silvana Jacqueline Mendoza Zélis, Pedro Pasquevich, Gustavo Alberto Rodríguez Torres, Claudia Elena
author_sort	Salcedo Rodríguez, Karen Lizeth
title	Role of defects on the magnetic behaviour of the geometrically frustrated spinel ZnFe2O4
title_short	Role of defects on the magnetic behaviour of the geometrically frustrated spinel ZnFe2O4
title_full	Role of defects on the magnetic behaviour of the geometrically frustrated spinel ZnFe2O4
title_fullStr	Role of defects on the magnetic behaviour of the geometrically frustrated spinel ZnFe2O4
title_full_unstemmed	Role of defects on the magnetic behaviour of the geometrically frustrated spinel ZnFe2O4
title_sort	role of defects on the magnetic behaviour of the geometrically frustrated spinel znfe2o4
publishDate	2018
url	http://sedici.unlp.edu.ar/handle/10915/96885 https://ri.conicet.gov.ar/11336/87528
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bdutipo_str	Repositorios
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Role of defects on the magnetic behaviour of the geometrically frustrated spinel ZnFe2O4

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