A Model Study of the Low-Energy Charge Dynamics of NaV_2O_5

Details A Model Study of the Low-Energy Charge Dynamics of NaV_2O_5 A Model Study of the Low-Energy Charge Dynamics of NaV_2O_5

1998-09-11

arxiv.org/abs/cond-mat/9809168v1

J. Phys. Soc. Jpn. 67 (1998) 4010-4013

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 gif figures. Hardcopies of figures (or the entire manuscript) can be obtained by e-mail request to ohta@science.s.c

Scientific paper

10.1143/JPSJ.67.4010

An exact-diagonalization technique on small clusters is used to calculate the dynamical density correlation functions of the dimerized t-J chain and coupled anisotropic t-J ladders (trellis lattice) at quarter filling, i.e., the systems regarded as a network of pairs (dimers or rungs) of sites coupled weakly via the hopping and exchange interactions. We thereby demonstrate that the intersite Coulomb repulsions between the pairs induce a low-energy collective mode in the charge excitations of the systems where the internal charge degrees of freedom of the pairs play an essential role. Implications to the electronic states of NaV_2O_5, i.e., fluctuations of the valence state of V ions and phase transition as a charge ordering, are discussed.

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