Quantum spin liquid in an antiferromagnet with four-spin interactions |
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Authors: | S S Aplesnin |
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Institution: | (1) Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 660036 Krasnoyarsk, Russia |
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Abstract: | A quantum Monte Carlo study of the anisotropic antiferromagnet with four-spin interaction (K) and with spin S=1/2 on a square lattice is reported. Temperature dependences of the capacity, susceptibility, spin correlation functions,
and correlation length, and field dependences of magnetization are calculated. Phase diagrams of the ground-state antiferromagnet
and gap (K>0) and gapless (K<0) quantum spin liquids are determined in the exchange-anisotropy-four-spin-coupling-constant (K), magnetic-field (H)-temperature (T), and temperature-(T)-K planes for an exchange anisotropy of 0.1 J.
Fiz. Tverd. Tela (St. Petersburg) 39, 1404–1409 (August 1997) |
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