Microscopic observation of the spin-Singlet cluster in the frustrated spinel AlV2O4

Yasuhiro Shimizu, Moe Tanaka, Masayuki Itoh, Takuro Katsufuji

    Research output: Contribution to journalArticle

    Abstract

    The spinel oxide AlV2O4 exhibits a structural phase transition from cubic to rhombohedral lattice at Tc 700 K, accompanied by V valence skipping. We have investigated the microscopic magnetic properties by the 51V and 27Al NMR measurements across Tc in a temperature range from 2 K to 850 K. The Knight shifts at the 51V and 27Al sites selectively monitor the local spin susceptibilities with different temperature dependence. We reveal that there are two V sites having a nonmagnetic ground state and a frustrated paramagnetic spin. The results are consistent with the spin-singlet heptamer formation consisting of seven vanadium atoms with 18 electrons. This transition uniquely releases the spin and charge frustration on the original V pyrochlore lattice with an aid of the orbital order and the structural distortion. The spin frustration is also highlighted in the anomalous magnetic correlations detected by the nuclear spin-lattice relaxation rate at the V and Al sites.

    Original languageEnglish
    Article number042181
    JournalJournal of Physics: Conference Series
    Volume150
    Issue number4
    DOIs
    Publication statusPublished - 2009

    Fingerprint

    spinel
    frustration
    nuclear magnetic resonance
    spin-lattice relaxation
    nuclear spin
    vanadium
    magnetic properties
    valence
    magnetic permeability
    orbitals
    temperature dependence
    ground state
    oxides
    atoms
    electrons
    temperature

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Microscopic observation of the spin-Singlet cluster in the frustrated spinel AlV2O4 . / Shimizu, Yasuhiro; Tanaka, Moe; Itoh, Masayuki; Katsufuji, Takuro.

    In: Journal of Physics: Conference Series, Vol. 150, No. 4, 042181, 2009.

    Research output: Contribution to journalArticle

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