Antiferromagnetic phase transition and spin correlations in NiO

Tapan Chatterji, G.J. McIntyre, Per-Anker Lindgård

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    Abstract

    We have investigated the antiferromagnetic (AF) phase transition and spin correlations in NiO by high-temperature neutron diffraction below and above TN. We show that AF phase transition is a continuous second-order transition within our experimental resolution. The spin correlations manifested by the strong diffuse magnetic scattering persist well above TN530 K and could still be observed at T=800 K which is about 1.5TN. We argue that the strong spin correlations above TN are due to the topological frustration of the spins on a fcc lattice. The Néel temperature is substantially reduced by this process. We determined the critical exponents =0.328±0.002 and =0.64±0.03 and the Néel temperature TN=530±1 K. These critical exponents suggest that NiO should be regarded as a 3dXY system
    Original languageEnglish
    JournalPhysical Review B. Condensed Matter and Materials Physics
    Volume79
    Issue number17
    Pages (from-to)172403
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    Copyright (2009) by the American Physical Society.

    Keywords

    • Materials research
    • Superconducting materials for the energy sector

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