The loss of anisotropy in MgB2 with Sc substitution and its relation with the critical temperature

The electrical conductivity anisotropy of the or-bands is calculated for the (Mg, Sc)B-2 system using a virtual crystal model. Our results reveal that the anisotropy drops with relatively little scandium content (< 30%): this behaviour coincides with the lowering of T-c and the reduction of the K...

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Detalles Bibliográficos
Autores: Tavizon, G, de la Mora, P, Ruiz, M
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2006
País:México
Institución:Universidad Nacional Autónoma de México
Repositorio:Sistema de Información de la Facultad de Ciencias, UNAM
OAI Identifier:oai:repositorio.fciencias.unam.mx:11154/1080
Acceso en línea:http://hdl.handle.net/11154/1080
Access Level:acceso abierto
Palabra clave:Physics, Condensed Matter
Descripción
Sumario:The electrical conductivity anisotropy of the or-bands is calculated for the (Mg, Sc)B-2 system using a virtual crystal model. Our results reveal that the anisotropy drops with relatively little scandium content (< 30%): this behaviour coincides with the lowering of T-c and the reduction of the Kohn anomaly. This anisotropy loss is also found in the Al and C doped systems. In this work it is argued that the anisotropy, or 2D-character, of the or-bands is an important parameter for the understanding of the high T-c found in MgB2.

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