One-dimensional ferrimagnetic behavior of a hetero-spin chain in an organic radical crystal as probed by susceptibility and relaxation time measurements

Daisuke Shiomi, Masahiro Nishizawa, Kazunobu Sato, Takeji Takui, Koichi Itoh, Hiromi Sakurai, Akira Izuoka, Tadashi Sugawara

    研究成果: Article

    3 引用 (Scopus)

    抜粋

    Spin state energies were calculated for a linear chain composed of a doublet radical and a biradical with a triplet ground state by numerical diagonalization of finite-size Heisenberg spin Hamiltonian. When all the intermolecular antiferromagnetic interactions couple the S=1/2 sites uniformly, a ferrimagnetic-like ground state appears. This finding is consistent with the simple picture of antiparallel alignment of different S's. On the other hand, quasi-degenerate low-lying excited states appear as the spatial symmetry of intermolecular antiferromagnetic interactions is lowered. The quasi-degeneracy breaks the stability of the ferrimagnetic-like ground state. This result gives a qualitative explanation of the susceptibility and the spin-spin relaxation time measured for a nitronylnitroxide-based molecular crystal composed of an S=1/2 and S=1 molecules. The instability of the ferrimagnetic-like ground state is inherent in multi-centered antiferromagnetic interactions between the open-shell organic molecular systems, suggesting a prerequisite for purely organic ferrimagnetic ordering.

    元の言語English
    ページ(範囲)279-294
    ページ数16
    ジャーナルMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
    278-279
    DOI
    出版物ステータスPublished - 1996 1 1

    ASJC Scopus subject areas

    • Condensed Matter Physics

    フィンガープリント One-dimensional ferrimagnetic behavior of a hetero-spin chain in an organic radical crystal as probed by susceptibility and relaxation time measurements' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用