Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-04-20
J. Phys. Soc. Jpn. 66 (1997) 3522-3527
Physics
Condensed Matter
Strongly Correlated Electrons
Latex 16 pages, 10 ps figures included, published in J. Phys. Soc. Jpn. with some minor modifications. (hasegawa@u-gakugei.ac.
Scientific paper
10.1143/JPSJ.66.3522
A systematic study has been made on the metal-insulator (MI) transition of the doubly degenerate Hubbard model (DHM) in the paramagnetic ground state, by using the slave-boson mean-field theory which is equivalent to the Gutzwiller approximation (GA). For the case of infinite electron-electron interactions, we obtain the analytic solution, which becomes exact in the limit of infinite spatial dimension. On the contrary, the finite-interaction case is investigated by numerical methods with the use of the simple-cubic model with the nearest-neighbor hopping. The mass-enhancement factor, $Z$, is shown to increase divergently as one approaches the integer fillings ($N = 1, 2, 3$), at which the MI transition takes place, $N$ being the total number of electrons. The calculated $N$ dependence of $Z$ is compared with the observed specific-heat coefficient, $\gamma$, of $Sr_{1-x}La_xTiO_3$ which is reported to significantly increase as $x$ approaches unity.
No associations
LandOfFree
The Metal-Insulator Transition in the Doubly Degenerate Hubbard Model 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 The Metal-Insulator Transition in the Doubly Degenerate Hubbard Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Metal-Insulator Transition in the Doubly Degenerate Hubbard Model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-147490