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- W1994037189 abstract "X-ray absorption spectroscopy (XAS) spectra near the O K-edge of A-site-ordered perovskite with A-site Cu2+ (S = 1/2) spins were measured. The spectra of ferromagnetic CaCu3Ge4O12 and CaCu3Sn4O12 showed hybridization between Cu 3d and O 2p orbitals, but magnetic circular dichroism measurement revealed that the O 2p orbital played a less important role in magnetic interaction. The XAS spectra of antiferromagnetic CaCu3Ti4O12, on the other hand, showed strong hybridization of the Cu 3d, Ti 3d, and O 2p orbitals. These results demonstrated that direct exchange interaction of the Cu2+ spins primarily determined the ferromagnetic ordering of CaCu3Ge4O12 and CaCu3Sn4O12, whereas the involvement of Ti 3d orbitals induced the antiferromagnetic property in CaCu3Ti4O12." @default.
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- W1994037189 date "2009-03-23" @default.
- W1994037189 modified "2023-10-09" @default.
- W1994037189 title "Orbital Hybridization and Magnetic Coupling of the A-Site Cu Spins in CaCu<sub>3</sub>B<sub>4</sub>O<sub>12</sub> (B = Ti, Ge, and Sn) Perovskites" @default.
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- W1994037189 doi "https://doi.org/10.1021/ic802166b" @default.
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