New Stacking Variations of the Charge and Orbital Ordering in the Metal-Ordered Manganite YBaMn_2O_6

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概要

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• We performed transmission electron microscopy (TEM) and powder neutron diffraction experiments on an A-site ordered manganese pcrovskite YBaMn_2O_6, which undergoes unusual and multiple phase transitions. In the paramagnetic insulating phase, the so-called CE type of charge and orbital ordering was observed in the monoclinic a-h plane, which has been frequently observed for the ordinary solid solution of A^〓_<1-x>A'^2_xMnO_3, around x = 0.5. TF.M revealed, however, a fourfold periodicity along the c axis, suggesting a new stacking pattern, in which planes of the CE type are built up according to the sequence[ααββ...]. Interestingly, when the system entered the antiferromagnetic state below 195 K, this stacking pattern changed into[αααα...] or[αβαβ...], suggesting a close interplay between spins and orbitals. The obtained stacking patterns were strongly correlated to the inherent structural alternation, i.e., the Y/Ba order along the c axis.

• 社団法人日本物理学会の論文
• 2003-02-15

著者

• Ohoyama K.

  Institute For Materials Research Tohoku University

• KAGEYAMA H.

  Material Design and Characterization Laboratory, Institute for Solid State Physics University of Tok

• NAKAJIMA T.

  Material Design and Characterization Laboratory, Institute for Solid State Physics University of Tok

• ICHIHARA M.

  Material Design and Characterization Laboratory, Institute for Solid State Physics University of Tok

• UEDA Y.

  Material Design and Characterization Laboratory, Institute for Solid State Physics University of Tok

• YOSHIZAWA H.

  Neutron Scattering Laboratory, Institute for Solid State Physics, The University of Tokyo

• Yoshizawa H.

  Neutron Scattering Laboratory Institute For Solid State Physics The University Of Tokyo

• Ichihara M

  Material Design And Characterization Laboratory Institute For Solid State Physics University Of Tokl

• Kageyama H.

  Material Design And Characterization Laboratory Institute For Solid State Physics University Of Toklyo

関連論文

• New Stacking Variations of the Charge and Orbital Ordering in the Metal-Ordered Manganite YBaMn_2O_6

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