ELEMENTARY EXCITATIONS AND SPIN DYNAMICS IN NANOWIRE QUANTUM MAGNETS

Tôru Sakai (), Takashi Tonegawa () and Kiyomi Okamoto ()
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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;
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

International Journal of Modern Physics C (IJMPC), 2009, vol. 20, issue 09, 1467-1476

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.

Keywords: Single-chain quantum magnet; elementary excitation; spin dynamics; magnetization plateau; quantum phase transition; 75.10.Jm; 75.40.Mg; 75.50.Gg; 75.40.Cx (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0129183109014527

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