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An electron correlation originated negative magnetoresistance in a system having a partly flat band | Ryotaro Arita
; Kazuhiko Kuroki
; Hideo Aoki
; | Date: |
11 Nov 1999 | Subject: | cond-mat | Abstract: | Inspired from an experimentally examined organic conductor, a novel mechanism for negative magnetoresistance is proposed for repulsively interacting electrons on a lattice whose band dispersion contains a flat portion (a flat bottom below a dispersive part here). When the Fermi level lies in the flat part, the electron correlation should cause ferromagnetic spin fluctuations to develop with an enhanced susceptibility. A relatively small magnetic field will then shift the majority-spin Fermi level to the dispersive part, resulting in a negative magnetoresistance. We have actually confirmed the idea by calculating the conductivity in magnetic fields, with the fluctuation exchange approximation, for the repulsive Hubbard model on a square lattice having a large second nearest-neighbor hopping. | Source: | arXiv, cond-mat/9911154 | Services: | Forum | Review | PDF | Favorites |
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