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

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)279-294
    Number of pages16
    JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
    Volume278-279
    DOIs
    Publication statusPublished - 1996 Jan 1

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Fingerprint Dive into the research topics of 'One-dimensional ferrimagnetic behavior of a hetero-spin chain in an organic radical crystal as probed by susceptibility and relaxation time measurements'. Together they form a unique fingerprint.

  • Cite this