High-temperature ferromagnetism of $sp$ electrons in narrow impurity bands: Application to CaB$_6$

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dc.creatorEdwards, D. M.
dc.creatorKatsnelson, M. I.
dc.date2006-05-21
dc.date.accessioned2026-07-07T07:09:04Z
dc.date.available2026-07-07T07:09:04Z
dc.descriptionFerromagnetism with high Curie temperature $T_c$, well above room temperature, and very small saturation moment has been reported in various carbon and boron systems. It is argued that the magnetization must be very inhomogeneous with only a small fraction of the sample ferromagnetically ordered. It is shown that a possible source of high $T_c$ within the ferromagnetic regions is itinerant electrons occupying a narrow impurity band. Correlation effects do not reduce the effective interaction which enters the Stoner criterion in the same way as in a bulk band. It is also shown how, in the impurity band case, spin wave excitations may not be effective in lowering $T_c$ below its value given by Stoner theory. These ideas are applied to CaB$_6$ and a thorough review of the experimental situation in this material is given. It is suggested that the intrinsic magnetism of the B$_2$ and O$_2$ dimers might be exploited in suitable structures containing these elements.
dc.description26 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0605495
dc.identifierhttp://arxiv.org/abs/cond-mat/0605495
dc.identifierJ. Phys.: Condens. Matter 18, 7209-7225 (2006)
dc.identifierdoi:10.1088/0953-8984/18/31/016
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/110928
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleHigh-temperature ferromagnetism of $sp$ electrons in narrow impurity bands: Application to CaB$_6$
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