Electronic configuration of Mn ions in the - molecular ferromagnet -Mn phthalocyanine studied by soft X-ray magnetic circular dichroism

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• 作者：T. Kataoka^a ; ^b ; ^{tktakashi.kataoka@nifty.com} ; ^{karter135@gmail.com} ; Y. Sakamoto^a ; ^b ; Y. Yamazaki^a ; ^b ; V.R. Singh^a ; ^b ; A. Fujimori^a ; ^b ; ^c ; Y. Takeda^c ; T. Ohkochi^c ; S.-I. Fujimori^c ; T. Okane^c ; Y. Saitoh^c ; H. Yamagami^c ; ^d ; A. Tanaka^e
• 关键词：A. Organic crystals ; D. Electron&ndash ; electron interactions ; D. Exchange and superexchange ; E. Synchrotron radiation
• 刊名：Solid State Communications
• 出版年：2012
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：May, 2012
• 卷：152
• 期：9
• 页码：806-809
• 文件大小：926 K

摘要

We have studied the electronic structure of the molecular ferromagnet -Mn phthalocyanine (-MnPc) in a polycrystalline form, which has been reported to show ferromagnetism at , by X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD). From the experimental results and subsequent cluster-model calculation, we find that the ferromagnetic Mn ion in -MnPc is largely in the ground state arising from the configuration of the Mn²⁺ state. Considering that the highest occupied molecular orbital (HOMO) of MnPc with the ground state originates from the orbital of the Mn²⁺ ion, it is proposed that - exchange coupling via the orbitals of the phthalocyanine ring plays a crucial role in the ferromagnetism of -MnPc.