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

Abstract

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.

18 pages LaTeX, 26 ps. figures

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Cited by in corpus (15)

• Evidence for coexistence of the superconducting gap and the pseudo - gap in Bi-2212 from intrinsic tunneling spectroscopy
• Interlayer tunneling spectroscopy of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$: a look from inside on the doping phase diagram of high $T_c$ superconductors
• Dispersion of Ordered Stripe Phases in the Cuprates
• The Phase Diagram of High-Tc Superconductors in the Presence of Dynamic Stripes
• Dynamical charge susceptibility in layered cuprates: the influence of screened inter-site Coulomb repulsion
• Evidence for two competing order parameters in underdoped cuprates superconductors from a model analysis of the Fermi-arc effects
• Upper critical field for underdoped high-T_c superconductors. Pseudogap and stripe--phase
• Phase Separation Models for Cuprate Stripe Arrays
• Remnant Fermi Surfaces in Photoemission
• Possible Competing Order-Induced Fermi Arcs in Cuprate Superconductors
• Tunneling Spectroscopy of the Underdoped High-$T_c$ Superconductors
• Flux Phase as a Dynamic Jahn-Teller Phase: Berryonic Matter in the Cuprates?
• Non-quasiparticle microwave absorption in $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$
• ab-plane tunneling and Andreev spectroscopy of superconducting gap and pseudogap in (Bi,Pb)2Sr2Ca2Cu3O10 and Bi2Sr2CaCu2O8
• Transport Properties Calculation for a Quasi-Bidimensional System using T-Matrix Approximation