Evidence for a-b-plane coupling to longitudinal c-axis phonons in high-Tc superconductors

M. Reedyk; T. Timusk

doi:10.1103/PhysRevLett.69.2705

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Evidence for a-b-plane coupling to longitudinal c-axis phonons in high-Tc superconductors

M. Reedyk, T. Timusk

DOI 10.1103/PhysRevLett.69.2705 · Physical Review Letters

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Abstract

We show that the strong absorption structure observed in the a-b-plane optical conductivity of the high-Tc superconductors is correlated with c-axis longitudinal optical (LOc) phonons. This suggests a resolution to the long-standing controversy over the origin of these features. The interaction with LOc phonons is forbidden when the incident wave vector q is normal to the c axis which leads to the surprising result, confirmed with experiments, that the optical properties along a or b are different when measured on the a-b-plane face and a face containing the c axis.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb2Sr2DyCu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	75	Pressure not reported	unknown