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arXiv · 1210.7228

Checkerboard to Stripe Charge Ordering Transition in TbBaFe2O5

D. K. Pratt·S. Chang·W. Tain·A. A. Taskin·Yoichi Ando·J. L. Zarestky·A. Kreyssig·A. I. Goldman·R. J. McQueeney
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Abstract

A combined neutron and x-ray diffraction study of TbBaFe2O5 reveals a rare checkerboard to charge ordering transition. TbBaFe2O5 is a mixed valent compound where Fe2+/Fe3+ ions are known to arrange into a stripe charge-ordered state below TV = 291 K, that consists of alternating Fe2+/Fe3+ stripes in the basal plane running along the b direction. Our measurements reveal that the stripe charge-ordering is preceded by a checkerboard charge-ordered phase between TV < T < 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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D. K. Pratt, S. Chang, W. Tain, A. A. Taskin, Yoichi Ando, J. L. Zarestky, A. Kreyssig, A. I. Goldman, R. J. McQueeney. 2013-02-06. Checkerboard to Stripe Charge Ordering Transition in TbBaFe2O5. https://doi.org/10.1103/physrevb.87.045127

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