Pinned Balseiro-Falicov Model of Tunneling and Photoemission in the Cuprates

Details Pinned Balseiro-Falicov Model of Tunneling and Photoemission in the Cuprates Pinned Balseiro-Falicov Model of Tunneling and Photoemission in the Cuprates

1998-07-04

arxiv.org/abs/cond-mat/9807068v1

Physics

Condensed Matter

Superconductivity

18 pages LaTeX, 26 ps. figures

Scientific paper

10.1103/PhysRevB.60.627

The smooth evolution of the tunneling gap of Bi_2Sr_2CaCu_2O_8 with doping from a pseudogap state in the underdoped cuprates to a superconducting state at optimal and overdoping, has been interpreted as evidence that the pseudogap must be due to precursor pairing. We suggest an alternative explanation, that the smoothness reflects a hidden SO(N) symmetry near the (pi,0) points of the Brillouin zone (with N = 3, 4, 5, or 6). Because of this symmetry, the pseudogap could actually be due to any of a number of nesting instabilities, including charge or spin density waves or more exotic phases. We present a detailed analysis of this competition for one particular model: the pinned Balseiro-Falicov model of competing charge density wave and (s-wave) superconductivity. We show that most of the anomalous features of both tunneling and photoemission follow naturally from the model, including the smooth crossover, the general shape of the pseudogap phase diagram, the shrinking Fermi surface of the pseudogap phase, and the asymmetry of the tunneling gap away from optimal doping. Below T_c, the sharp peak at Delta_1 and the dip seen in the tunneling and photoemission near 2Delta_1 cannot be described in detail by this model, but we suggest a simple generalization to account for inhomogeneity, which does provide an adequate description. We show that it should be possible, with a combination of photoemission and tunneling, to demonstrate the extent of pinning of the Fermi level to the Van Hove singularity. A preliminary analysis of the data suggests pinning in the underdoped, but not in the overdoped regime.

Affiliated with

Also associated with

No associations

Rating

Pinned Balseiro-Falicov Model of Tunneling and Photoemission in the Cuprates 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 Pinned Balseiro-Falicov Model of Tunneling and Photoemission in the Cuprates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pinned Balseiro-Falicov Model of Tunneling and Photoemission in the Cuprates will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-61317