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Rocquefelte, X., Schwarz, K. & Blaha, P. (2012) Theoretical Investigation of the Magnetic Exchange Interactions in Copper(II) Oxides under Chemical and Physical Pressures. Sci Rep, 2 759.
Added by: Laurent Cournède (2016-03-10 21:28:38) |
| Type de référence: Article DOI: 10.1038/srep00759 Numéro d'identification (ISBN etc.): 2045-2322 Clé BibTeX: Rocquefelte2012 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: chains, cuo, diffraction, excitations Créateurs: Blaha, Rocquefelte, Schwarz Collection: Sci Rep |
Consultations : 1/591
Indice de consultation : 4% Indice de popularité : 1% |
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It remains a challenge to understand the unconventional mechanisms that cause high-TC superconductivity in cuprate superconductors, high-TC multiferroicity in CuO, or low-dimensional magnetism in the spin-Peierls transition compounds such as CuGeO3. A common feature of all these copper oxide compounds (containing Cu2+ ions) is the presence of large magnetic superexchange interactions J. It is a general strategy to apply chemical and/or physical pressure in order to tune these exotic properties. Here we show theoretically, for the first time, the impact of physical pressure on J on CuO, for which we predict a strong enhancement of the low-dimensionality of the magnetic interactions and the spin-frustration at high-pressures. Such modifications are expected to strongly influence the multiferroic properties of CuO. We finally demonstrate that PBE0 hybrid DFT calculations provide reliable J values for a wide range of copper(II) oxides compounds, i.e. CuGeO3, BaCu2Si2O7, BaCu2Ge2O7, and La2CuO4.
Added by: Laurent Cournède |