Charge Fluctuations in Geometrically Frustrated Charge Ordering System

Details Charge Fluctuations in Geometrically Frustrated Charge Ordering System Charge Fluctuations in Geometrically Frustrated Charge Ordering System

2006-07-31

arxiv.org/abs/cond-mat/0607804v1

J. Phys Soc. Jpn. 11, 114707 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 9 figures

Scientific paper

10.1143/JPSJ.75.114707

Effects of geometrical frustration in low-dimensional charge ordering systems are theoretically studied, mainly focusing on dynamical properties. We treat extended Hubbard models at quarter-filling, where the frustration arises from competing charge ordered patterns favored by different intersite Coulomb interactions, which are effective models for various charge transfer-type molecular conductors and transition metal oxides. Two different lattice structures are considered: (a) one-dimensional chain with intersite Coulomb interaction of nearest neighbor V_1 and that of next-nearest neighbor V_2, and (b) two-dimensional square lattice with V_1 along the squares and V_2 along one of the diagonals. From previous studies, charge ordered insulating states are known to be unstable in the frustrated region, i.e., V_1 \simeq 2V_2 for case (a) and V_1 \simeq V_2 for case (b), resulting in a robust metallic phase even when the interaction strenghs are strong. By applying the Lanczos exact diagonalization to finite-size clusters, we have found that fluctuations of different charge order patterns exist in the frustration-induced metallic phase, showing up as characteristic low energy modes in dynamical correlation functions. Comparison of such features between the two models are discussed, whose difference will be ascribed to the dimensionality effect. We also point out incommensurate correlation in the charge sector due to the frustration, found in one-dimensional clusters.

Affiliated with

Also associated with

No associations

Rating

Charge Fluctuations in Geometrically Frustrated Charge Ordering System does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Charge Fluctuations in Geometrically Frustrated Charge Ordering System, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Charge Fluctuations in Geometrically Frustrated Charge Ordering System will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-33688