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New Stacking Variations of the Charge and Orbital Ordering in the Metal-Ordered Manganite YBaMn 2 O 6

2003; Physical Society of Japan; Volume: 72; Issue: 2 Linguagem: Inglês

10.1143/jpsj.72.241

1347-4073

Hiroshi Kageyama, Tomohiko Nakajima, Masaki Ichihara, Yutaka Ueda, H. Yoshizawa, Kenji Ohoyama,

Multiferroics and related materials

For the paramagnetic insulating phase in the metal-ordered manganite YBaMn2O6, the so-called CE-type of charge/orbital ordered state was observed within the monoclinic ab-plane, which is most commonly observed for the ordinary half doped manganites. However, TEM revealed a 4-fold periodicity along the c-axis, suggesting a new stacking pattern, where planes of the CE-type are built up according to the sequence [aabb...]. Interestingly, when th system enters into the antiferromagnetic state, this stacking pattern changes into [aaaa...] or [abab], suggesting close interplay between spins and orbitals. These features are discusses in terms of inherent structural alternation, i.e., the Y/Ba order along the c-axis.