Artículo
Disorder effects in the S1⁄41 antiferromagnetic spin ladder CaV2O4
Fecha de publicación:
11/05/2015
Editorial:
Elsevier Science
Revista:
Journal Of Magnetism And Magnetic Materials
ISSN:
0304-8853
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We study the physical properties of the antiferromagnetic spin ladder CaV2O4 (CVO) and the Y-doped related compound Ca0.9Y0.1V2O4. In the latter, X-ray diffraction demonstrates the segregation of a small amount of a vanadium–perovskite impurity phase, leading to the formation of V vacancies within the main CVO-type structure. The 1D character of this calcium–vanadite enhances the influence of the vacancies on the electric and magnetic properties of Ca0.9Y0.1V2O4. Electrical transport is characterized by a variable-range hopping mechanism determined by the charging energy of nm-sized segments of V chains delimited by V vacancies, i.e. a Coulomb gap is formed at the Fermi level. These vacancies also locally affect the magnetic correlations, breaking the long-range AFM order observed in CaV2O4 and producing exchange bias when the Y-doped sample is cooled with an applied magnetic field.
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Guitarra, S.R.; Caneiro, Alberto; Niebieskikwiat, Dario Gabriel; Disorder effects in the S1⁄41 antiferromagnetic spin ladder CaV2O4; Elsevier Science; Journal Of Magnetism And Magnetic Materials; 392; 2015; 11-5-2015; 63-67
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