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7 papers · 2 filters
Optical conductivity in the CuO double chains of PrBa_2Cu_4O_8: Consequences of charge fluctuation
R. Amasaki, Y. Shibata, Y. Ohta
We calculate the optical conductivity of the CuO double chains of PrBaCuO by the mean-field approximation for the coupled two-chain Hubbard model around quarter filling…
Charge and Orbital Ordering in the Triangular-Lattice t_{2g}-Orbital System in One Dimension: A Possible Ground State of Bi_xV_8O_{16}
Y. Shibata, Y. Ohta
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 stro…
Charge Ordering in the One-Dimensional Extended Hubbard Model: Implication to the TMTTF Family of Organic Conductors
Y. Shibata, S. Nishimoto, Y. Ohta
We study the charge ordering (CO) in the one-dimensional (1D) extended Hubbard model at quarter filling where the nearest-neighbor Coulomb repulsion and dimerization in the hopping…
Low-Temperature Structure of the Quarter-Filled Ladder Compound alpha'-NaV2O5
Hiroshi Sawa, Emi Ninomiya, Tetsuo Ohama +7
The low-temperature (LT) superstructure of -NaVO was determined by synchrotron radiation x-ray diffraction. Below the phase transition temperature associated with atomi…
Magnetic Excitations of the Spin Gap System TlCuCl
A. Oosawa, T. Kato, H. Tanaka +3
TlCuCl has a singlet ground state with the excitation gap meV. The magnetic excitations in TlCuCl have been investigated by means of neutron inelastic scattering e…
Field-Induced Two-Step Phase Transitions in the Singlet Ground State Triangular Antiferromagnet CsFeBr
Y. Tanaka, H. Tanaka, T. Ono +7
The ground state of the stacked triangular antiferromagnet CsFeBr is a spin singlet due to the large single ion anisotropy . The field-induced magnetic ordering in th…