TY - JOUR
T1 - Ferromagnetic cuprates Ca Cu3 Ge4 O12 and Ca Cu3 Sn4 O12 with a -site ordered perovskite structure
AU - Shiraki, H.
AU - Saito, T.
AU - Yamada, Takahiro
AU - Tsujimoto, M.
AU - Azuma, M.
AU - Kurata, H.
AU - Isoda, S.
AU - Takano, M.
AU - Shimakawa, Y.
PY - 2007/10/11
Y1 - 2007/10/11
N2 - A -site ordered perovskites Ca Cu3 Ge4 O12 and Ca Cu3 Sn4 O12, which are isostructural to antiferromagnetic Ca Cu3 Ti4 O12, were found to be ferromagnets. The special alignment of the Cu O4 planes in the perovskite structure plays an important role in the magnetic properties of Cu2+ spins. Direct exchange interaction gives rise to the ferromagnetic behavior in Ca Cu3 Ge4 O12 and Ca Cu3 Sn4 O12, whereas involvement of Ti-3d orbitals produces the antiferromagnetic superexchange interaction in Ca Cu3 Ti4 O12. This finding demonstrates that either ferromagnetic or antiferromagnetic behavior can appear within the same structural framework.
AB - A -site ordered perovskites Ca Cu3 Ge4 O12 and Ca Cu3 Sn4 O12, which are isostructural to antiferromagnetic Ca Cu3 Ti4 O12, were found to be ferromagnets. The special alignment of the Cu O4 planes in the perovskite structure plays an important role in the magnetic properties of Cu2+ spins. Direct exchange interaction gives rise to the ferromagnetic behavior in Ca Cu3 Ge4 O12 and Ca Cu3 Sn4 O12, whereas involvement of Ti-3d orbitals produces the antiferromagnetic superexchange interaction in Ca Cu3 Ti4 O12. This finding demonstrates that either ferromagnetic or antiferromagnetic behavior can appear within the same structural framework.
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U2 - 10.1103/PhysRevB.76.140403
DO - 10.1103/PhysRevB.76.140403
M3 - Article
AN - SCOPUS:35348873162
SN - 0163-1829
VL - 76
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 14
M1 - 140403
ER -