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A Neutron Diffraction Study of Co2Ru1−xMnxO4 Spinels

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Abstract

Powder neutron diffraction and magnetization measurements are presented on the Co2Ru1-xMnxO4 system. In these materials the tetrahedral (A) sites are occupied by Co2+ (S = 3/2) ions, and the octahedral (B) sites are jointly occupied by Co3+ (low spin, S = 0), Ru3+ (low spin, S = 1/2), and Mn3+ (S = 2) ions. The measurements reveal that Co2RuO4 undergoes a spin-glass transition, Co2MnO4 is a collinear ferrimagnet, and that Co2Ru0.5Mn0.5O4 undergoes an unusual magnetic double transition. Triple-axis measurements indicate that the lower temperature transition in Co2Ru0.5Mn0.5O4 is characterized by the onset of diffuse scattering and the emergence of short-range order. The Co2Ru1-xMnxO4 series appears to be well-suited for studying the coexistence of long- and short-range magnetic order.

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Authors and Affiliations

  1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    D. Mandrus, V. Keppens, B. C. Chakoumakos, G. E. Granroth & S. E. Nagler

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  1. D. Mandrus
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  2. V. Keppens
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  3. B. C. Chakoumakos
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  4. G. E. Granroth
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  5. S. E. Nagler
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Mandrus, D., Keppens, V., Chakoumakos, B.C. et al. A Neutron Diffraction Study of Co2Ru1−xMnxO4 Spinels. MRS Online Proceedings Library 547, 177–182 (1998). https://doi.org/10.1557/PROC-547-177

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