Ferro-orbital order in the charge- and cation-ordered manganite YBaMn{sub 2}O{sub 6}
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh, EH9 3JZ (United Kingdom)
Powder neutron diffraction reveals a subtle triclinic distortion in the 300 K structure of the Y{sup 3+}/Ba{sup 2+} cation-ordered and Mn{sup 3+}/Mn{sup 4+} charge-ordered perovskite YBaMn{sub 2}O{sub 6}(Y{sub 0.5}Ba{sub 0.5}MnO{sub 3}). The refined structure shows a ferro-orbital ordering (FOO) in which d{sub z}{sup 2}-type orbitals associated with the Jahn-Teller Mn{sup 3+} states are oriented in a parallel fashion. This ground state has not previously been found in AMnO{sub 3} manganites, although the alternative antiferro-orbital ordering (AFOO) is commonly observed, for example, in the analog TbBaMn{sub 2}O{sub 6}. 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 TbBaMn{sub 2}O{sub 6}.
- OSTI ID:
- 20719130
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 2 Vol. 72; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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