Valence-Bond Crystal and Anisotropic Excitation Spectrum on 3-Dimensionally Frustrated Pyrochlore.

  • Isoda Makoto
    Department of Physics, Fukuyama University, Fukuyama 729–0292
  • Mori Shigeyoshi
    Department of Physics, Fukuyama University, Fukuyama 729–0292

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説明

The valence-bond crystal is proposed as a ground state of spin-1/2 Heisenberg antiferromagnet on 3-dimensional fully frustrated pyrochlore by the bond-operator theory. This crystal, formed as a set of RVB-like tetrahedral singlet states, has lower energy than the state consisting of two dimers in a tetrahedron. The spectra of triplet excitation have a finite gap and a symmetry lower than that of the lattice. The comparison with Y(Sc)Mn2 is discussed.

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