Checkerboard to Stripe Charge Ordering Transition in TbBaFe$_2$O$_5$

ORAL

Abstract

A combined neutron and x-ray diffraction study of TbBaFe$_2$O$_5$ reveals a rare checkerboard to charge ordering transition. TbBaFe$_2$O$_5$ is a mixed valent compound where Fe$^{2+}$/Fe$^{3+}$ ions are known to arrange into a stripe charge-ordered state below $T_{V} =$ 291 K, that consists of alternating Fe$^{2+}$/Fe$^{3+}$ stripes in the basal plane running along the \textbf{\textit{b}} direction. Our measurements reveal that the stripe charge-ordering is preceded by a checkerboard charge-ordered phase between $T_{V}$\textit{ \textless\ T} \textit{\textless\ T}* $=$ 308 K. The checkerboard ordering is stabilized by inter-site coulomb interactions which give way to a stripe state stabilized by orbital ordering.

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Authors

  • Daniel Pratt

    • NIST Center for Neutron Research, Gaithersburg, MD 20899
    • NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

  • Sung Chang

    • NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

  • Wei Tian

    • Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • Alexey Taskin

    • ISIR, Osaka University
    • Department of Frontier Materials Creation, Osaka University, Osaka Japan

  • Yoichi Ando

    • Department of Frontier Materials Creation, Osaka University, Osaka Japan

  • Jerel Zarestky

    • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • Andreas Kreyssig

    • Ames Laboratory and Iowa State University
    • Ames Lab. DoE
    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA
    • Ames Laboratory, US DOE, Iowa State University, Ames, IA 50011, USA

  • Alan Goldman

    • Ames Laboratory and Iowa State University
    • Ames Lab. DoE
    • Ames Laboratory, US DOE, Iowa State University, Ames, IA 50011, USA

  • Robert McQueeney

    • Ames Lab. DoE
    • Ames Laboratory, US DOE, Iowa State University, Ames, IA 50011, USA