Metal-Insulator Transitions in Degenerate Hubbard Models and A$_x$C$_{60}$

Details Metal-Insulator Transitions in Degenerate Hubbard Models and A$_x$C$_{60}$ Metal-Insulator Transitions in Degenerate Hubbard Models and A$_x$C$_{60}$

1993-06-09

arxiv.org/abs/cond-mat/9306025v1

Physics

Condensed Matter

10 pages, Revtex

Scientific paper

10.1103/PhysRevB.49.5687

Mott-Hubbard metal-insulator transitions in $N$-fold degenerate Hubbard models are studied within the Gutzwiller approximation. For any rational filling with $x$ (integer) electrons per site it is found that metal-insulator transition occurs at a critical correlation energy $U_c(N,x)=U_c(N,2N-x)=\gamma(N,x)|\bar{\epsilon}(N,x)|$, where $\bar{\epsilon}$ is the band energy per particle for the uncorrelated Fermi-liquid state and $\gamma(N,x)$ is a geometric factor which increases linearly with $x$. We propose that the alkali metal doped fullerides $A_xC_{60}$ can be described by a 3-fold degenerate Hubbard model. Using the current estimate of band width and correlation energy this implies that most of ${\rm A_xC_{60}}$, at integer $x$, are Mott-Hubbard insulators and ${\rm A_3C_{60}}$ is a strongly correlated metal.

Affiliated with

Also associated with

No associations

Rating

Metal-Insulator Transitions in Degenerate Hubbard Models and A$_x$C$_{60}$ 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 Metal-Insulator Transitions in Degenerate Hubbard Models and A$_x$C$_{60}$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metal-Insulator Transitions in Degenerate Hubbard Models and A$_x$C$_{60}$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-388198