First-Order Phase Transition in the S = 1 Quantum Spin Chain with Partial Integrability.

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  • Sato Ryutaro
    Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka 560
  • Akutsu Yasuhiro
    Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka 560

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  • First-Order Phase Transition in the S 1
  • First-Order Phase Transition in the<b><i><i>S</i></i>=1</b>Quantum Spin Chain with Partial Integrability

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Abstract

The zero-temperature magnetization curve of the S=1 antiferromagnetic XXZ chain with partial integrability is studied by the Bethe ansatz, combined with a numerical renormalization-group method. We find a magnetic first-order phase transition; the magnetization curve shows a discontinuity at a critical field h_c. Due to the partial integrability, the low-field curve and the high-field curve each correspond to a part of the magnetization curve of the S=\frac12XXZ chain. We conclude that the obtained magnetization curve is exact in the whole range of the magnetic field.

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