Structure and properties of the integer-spin frustrated antiferromagnet GeNi2O4

M. K. Crawford, R. L. Harlow, P. L. Lee, Y. Zhang, J. Hormadaly, R. Flippen, Q. Huang, J. W. Lynn, R. Stevens, B. F. Woodfield, J. Boerio-Goates, R. A. Fisher

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    Abstract

    We report the results of magnetic susceptibility, specific heat, synchrotron x-ray, and neutron powder diffraction measurements for the normal spinel GeNi2O4, which becomes antiferromagnetic below a Néel temperature (TN) of 12 K. The Néel transition occurs in two discrete steps, separated in temperature by 0.6 K. The total magnetic entropy evaluated from the specific heat data is only ∼1/2 of the expected 2R ln 3 per mole of GeNi2O4. The specific heat data also suggest the presence of both gapless and gapped excitations within the Néel state. GeNi2O4 remains cubic to temperatures well below TN.

    Original languageEnglish
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume68
    Issue number22
    DOIs
    StatePublished - 31 Dec 2003

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