High-Field Phase Transitions in Integrable Quantum Spin Chains
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概要
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We study the integrable SU (M) and SU_q(M) quantum spin chains in the high-magnetic-field region at zero temperature. For M=4 we found second-order phase transitions at two different fields, H_1 and H_2. At both transition points, the magnetization curve versus magnetic field has cusps with discontinuities in the magnetic susceptibility. We clarify the mechanism of the phase transitions, from which we conclude that the SU(M) and SU_q(M) quantum spin chains undergo (M-2) times field-induced phase transitions at zero temperature.
- 社団法人日本物理学会の論文
- 1994-12-15
著者
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Akutsu Yasuhiro
Department Of Physics Faculty Of Science Osaka University
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Kiwata Hirohito
Department Of Physics Faculty Of Science Osaka University
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