Model for the low-temperature magnetic phases observed in doped YBa2Cu3O6+x

N.H. Andersen, G. Uimin

    Research output: Contribution to journalJournal articleResearch

    Abstract

    A classical statistical model for the antiferromagnetic ordering of the Cu spins in the CuO2 planes of reduced YBa2Cu3O6+x-type materials is presented. The magnetic phases considered are the experimentally observed high-temperature antiferromagnetic (AFI) phase with ordering vector Q(I)=(1/2 1/2 0), and the low- temperature phases: antiferromagnetic (AFII) with Q(II)=(1/2 1/2 1/2) and intermediate Turn-Angle (TA) phases TAI, TAII, and TAIII with components of both ordering vectors. It is shown that the AFII and TA phases result from an effective ferromagnetic-type coupling mediated by free spins in the CuOx basal plane. Good agreement with experimental data is obtained for realistic model parameters.
    Original languageEnglish
    JournalPhysical Review B
    Volume56
    Issue number17
    Pages (from-to)10840-10843
    ISSN2469-9950
    DOIs
    Publication statusPublished - 1997

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