Competing Spin-Gap Phases in a Frustrated Quantum Spin System in Two Dimensions.

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  • Takushima Yoshihiro
    Department of Applied Physics, Osaka University, Suita, Osaka 565-0871
  • Koga Akihisa
    Department of Applied Physics, Osaka University, Suita, Osaka 565-0871
  • Kawakami Norio
    Department of Applied Physics, Osaka University, Suita, Osaka 565-0871

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We investigate quantum phase transitions among the spin-gap phases and the magnetically ordered phases in a two-dimensional frustrated antiferromagnetic spin system, which interpolates several important models such as the orthogonal-dimer model as well as the model on the 1/5-depleted square lattice. By computing the ground state energy, the staggered susceptibility and the spin gap by means of the series expansion method, we determine the ground-state phase diagram and discuss the role of geometrical frustration. In particular, it is found that a RVB-type spin-gap phase proposed recently for the orthogonal-dimer system is adiabatically connected to the plaquette phase known for the 1/5-depleted square-lattice model.

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