Charge and Orbital Ordering in the Triangular-Lattice t_<2g>-Orbital System in One Dimension : A Possible Ground State of Bi_xV_8O_<16>

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概要

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• We consider the possible charge and orbital ordering in a Hollandite compound Bi_xV_8O_<16>, which is a new one-dimensional triangular-lattice t_<2g>-orbital system. Using the strong-coupling perturbation theory, we derive the effective spin-orbit Hamiltonian in the approximation neglecting the small off-diagonal hopping parameters or orbital fluctuation, whereby we obtain the spin Hamiltonians in the partial space of each orbital-ordering pattern. We then apply an exact-diagonalization technique on small clusters to these spin Hamiltonians and calculate the ground-state phase diagram. We find that a variety of orbital-ordering patterns appear in the parameter space, which include the state characterized by the partial spin-singlet formation consistent with recent NMR experiment.

• 社団法人日本物理学会の論文
• 2002-02-15

著者

• Yukinori Ohta

  Graduate School Of Science And Technology Chiba University:department Of Physics Chiba University

• Ohta Yukinori

  Graduate School Of Science And Technology Chiba University:department Of Physics Chiba University

• Ohta Yukinori

  Department Of Applied Physics Nagoya University

• SHIBATA Yoshinori

  Graduate School of Science and Technology, Chiba University

• Shibata Yoshinori

  Graduate School Of Science And Technology Chiba University

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