Electronic Structure of La1.85Sr0.15CuO4: Characterization of a Fermi Level Band Crossing

Details Electronic Structure of La1.85Sr0.15CuO4: Characterization of a Fermi Level Band Crossing Electronic Structure of La1.85Sr0.15CuO4: Characterization of a Fermi Level Band Crossing

1997-11-18

arxiv.org/abs/cond-mat/9711184v2

Physics

Condensed Matter

Superconductivity

TeX file (16 pages) and PostScript figure file (3 pages)

Scientific paper

We present the results of a new Hubbard model for optimally doped LaSrCuO. This model uses parameters derived from BLYP calculations on the cluster CuO6. It explicitly includes the Cu dx2-y2 and dz2 orbitals, the O psigma orbitals, and the apical O pz orbitals. When correlation is properly included in the Hubbard model, we find that there is a crossing of two bands in the vicinity of the Fermi level for the optimally doped superconductor. This crossing rigorously occurs along the (0,0)-(pi,pi) direction of the 2D Brillouin zone. The crossing arises due to the overlap of a broad "B1g" band dominated by Cu dx2-y2 character and a narrower "A1g" band dominated by Cu dz2 character. We conclude that optimal doping of LaSrCuO and related materials is achieved when the Fermi levels coincides with this crossing. At this point, formation of Cooper pairs between the two bands (i.e. inter-band or IBP) leads to superconductivity. Furthermore, using geometric considerations, we extend our conclusions to YBaCuO and offer a simple explanation for the seemingly complex behavior of Tc as a function of doping in this material. This behavior can be understood on the basis of multiple band crossings.

Affiliated with

Also associated with

No associations

Rating

Electronic Structure of La1.85Sr0.15CuO4: Characterization of a Fermi Level Band Crossing 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 Electronic Structure of La1.85Sr0.15CuO4: Characterization of a Fermi Level Band Crossing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic Structure of La1.85Sr0.15CuO4: Characterization of a Fermi Level Band Crossing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-460560