Tunneling Density of States of High Tc Superconductors: d-Wave BCS Model versus SU(2) Slave-Boson Model
Walter Rantner, Xiao-Gang Wen
DOI 10.1103/PhysRevLett.85.3692 · Physical Review Letters
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Abstract
Motivated by recent experimental measurements of the tunneling characteristics of high Tc materials using scanning tunneling spectroscopy, we have calculated the I−V and differential conductance curves in the superconducting state at zero temperature. Comparing BCS-like d-wave pairing and the SU(2) slave-boson approach, we find that the slave-boson model can explain the asymmetric background observed in experiments. The slave-boson model also predicts that the height of the conductance peak relative to the background is proportional to the hole doping concentration x, at least for underdoped samples. We also observe the absence of the van Hove singularity, and comment on possible implications.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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