Induced superconductivity in noncuprate layers of the Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ high-temperature superconductor: Modeling of scanning tunneling spectra

Abstract

We analyze how the coherence peaks observed in Scanning Tunneling Spectroscopy (STS) of cuprate high temperature superconductors are transferred from the cuprate layer to the oxide layers adjacent to the STS microscope tip. For this purpose, we have carried out a realistic multiband calculation for the superconducting state of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ (Bi2212) assuming a short range d-wave pairing interaction confined to the nearest-neighbor Cu $d_{x^2-y^2}$ orbitals. The resulting anomalous matrix elements of the Green's function allow us to monitor how pairing is then induced not only within the cuprate bilayer but also within and across other layers and sites. The symmetry properties of the various anomalous matrix elements and the related selection rules are delineated.

9 pages, 2 figures. Accepted for publication in Phys. Rev. B

References in corpus (13)

• Scanning tunneling spectroscopy of high-temperature superconductors
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• Nature of c-axis coupling in underdoped Bi2Sr2CaCu2O8 with varying degrees of disorder

Cited by in corpus (2)

• Intermediate Coupling Model of the Cuprates
• Effect of orbital symmetry of the tip on Scanning Tunneling Spectra of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$