Superconductive Excitations and the Infrared Vibronic Spectra of BSCCO
J.C. Phillips (Rutgers University)
TL;DR
This paper investigates the infrared spectra of BSCCO, linking a specific spectral feature to split apical oxygen interstitials, and explains its relation to superconductivity through topological theoretical methods.
Contribution
It introduces a topological theoretical approach to identify the origin of a key infrared spectral feature in BSCCO, connecting it to superconductivity and oxygen interstitials.
Findings
Spectral feature at 600-750 cm-1 linked to split apical oxygen interstitials
Correlation between dopant concentration and superconductivity
Theoretical explanation of infrared and photoemission spectral similarities
Abstract
The oxygen dopant concentration dependence of the "quasiparticle" feature at 600-750 cm-1 of the infrared spectrum of Bi2Sr2CaCu2O8+delta (BSCCO), lying near and above the top of the host phonon spectrum at 600 cm-1, is strongly correlated with superconductivity. Using parameter-free topological methods, theory assigns this feature to split apical oxygen interstitials. It explains both the qualitative similarities and the quantitative differences between "quasiparticle" features identified in infrared and phtoemission data, as well as identifying new features in the infrared spectra.
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