High Temperature Molecular Magnetism Caused by pi-electrons: Copper Phthalocyanine Doped with Alkaline Metals

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dc.creatorSharoyan, E. G.
dc.creatorManukyan, A. S.
dc.date2005-04-14
dc.date.accessioned2026-07-07T03:04:44Z
dc.date.available2026-07-07T03:04:44Z
dc.descriptionElectron spin resonance spectra of copper phthalocyanine doped with alkaline metals (AxCuPc) have been investigated. The temperature dependence of ESR spectra indicates the ferromagnetic behavior. The Curie-Weiss temperature varies from 30K to 115K depending on the stoichiometry x of samples. Some particles of polycrystalline samples were attracted to a weak magnet at temperature slightly higher than 77K. The observed magnetism is caused by unpaired pi-electrons of phthalocyanine anions on the Eg doubly degenerated molecular orbital. The observed ferromagnetism can be understood within the framework of the McConnell-2 model proposed for organic ferromagnetic charge-transfer complexes. The high-temperature magnetism in AxCuPc is considered to be a result of the Zener mechanism of double exchange between phthalocyanine molecular anions of different valence.
dc.description6 pages, 5 figures. submitted to: Journal of Porphyrins and Phthalocyanines
dc.identifierhttps://arxiv.org/abs/cond-mat/0504354
dc.identifierhttp://arxiv.org/abs/cond-mat/0504354
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26199
dc.subjectMaterials Science
dc.titleHigh Temperature Molecular Magnetism Caused by pi-electrons: Copper Phthalocyanine Doped with Alkaline Metals
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