Ferro-orbital order in the charge- and cation-ordered manganite YBaMn2O6

Anthony Williams, J Attfield

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Powder neutron diffraction reveals a subtle triclinic distortion in the 300 K structure of the Y3+∕Ba2+ cation-ordered and Mn3+∕Mn4+ charge-ordered perovskite YBaMn2O6(Y0.5Ba0.5MnO3). The refined structure shows a ferro-orbital ordering (FOO) in which dz2-type orbitals associated with the Jahn-Teller Mn3+ states are oriented in a parallel fashion. This ground state has not previously been found in AMnO3 manganites, although the alternative antiferro-orbital ordering (AFOO) is commonly observed, for example, in the analog TbBaMn2O6. Lattice distortions that determine the balance between FOO and AFOO states result from the size mismatch between Y or Tb and Ba, and a high-temperature AFOO to FOO transition is evidenced in TbBaMn2O6.

Original languageEnglish
Article number024436
Number of pages5
JournalPhysical Review B
Issue number2
Early online date18 Jul 2005
Publication statusPublished - 2005

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