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Elementary Excitations And Spin Dynamics In Nanowire Quantum Magnets

Author

Listed:
  • TÔRU SAKAI

    (Synchrotron Radiation Research Center, Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA), SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan;
    CREST Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan)

  • TAKASHI TONEGAWA

    (Department of Mechanical Engineering, Fukui University of Technology, Fukui 910-8505, Japan)

  • KIYOMI OKAMOTO

    (Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan)

Abstract

We investigate the elementary excitations and magnetization dynamics of the recently synthesized single-chain magnets, which consist ofMnandNiions, and some related systems, using the numerical exact diagonalization of finite-size clusters and the density matrix renormalization group method. It is found that, as the easy-axis anisotropyDincreases, a crossover of the lowest-lying elementary excitation should exist between the spin wave and Ising-like excitations. For the realistic trimer single-chain magnet, we estimate several crossover temperatures. In addition we predict that a magnetization plateau at 2/3 of the saturation magnetization would appear in the(s, S) = (1, 2)spin-alternating chain. The phase diagram of the plateau is also presented.

Suggested Citation

  • Tôru Sakai & Takashi Tonegawa & Kiyomi Okamoto, 2009. "Elementary Excitations And Spin Dynamics In Nanowire Quantum Magnets," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 20(09), pages 1467-1476.
    • Handle: RePEc:wsi:ijmpcx:v:20:y:2009:i:09:n:s0129183109014527
    DOI: 10.1142/S0129183109014527
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