Magnetic and Critical Properties of Alternating Spin Chain with<b><i><i>S</i></i>=1/2, 1</b>in Magnetic Fields

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  • Fujii Mitsuru
    Department of Applied Physics, Osaka University, Suita, Osaka 565
  • Fujimoto Satoshi
    Department of Physics, Kyoto University, Kyoto 606
  • Kawakami Norio
    Department of Applied Physics, Osaka University, Suita, Osaka 565 Department of Material and Life Science, Osaka University, Suita, Osaka 565

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  • Magnetic and Critical Properties of Alternating Spin Chain with S=1/2, 1 in Magnetic Fields.
  • Magnetic and Critical Properties of Alt

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We study an integrable spin chain with an alternating array of spins S=1/2, 1 in external magnetic fields using the Bethe ansatz exact solution. The calculated magnetization curve has a cusp at a critical magnetic field H=HC, at which the specific heat shows a divergence property.We also calculate finite-size corrections to the energy spectrum, and obtain the critical exponents of correlation functionsusing conformal field theory (CFT). Low-energy properties of the model are described by two c=1 U(1) CFTs at H<HC and one c=1 U(1) CFT at H>HC.

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