Normal state electronic structure in the heavily overdoped regime of Bi1.74Pb0.38Sr1.88CuO6+delta single-layer cuprate superconductors

TL;DR

This study investigates the electronic structure of heavily overdoped Bi1.74Pb0.38Sr1.88CuO6+delta, revealing phonon and spin fluctuation influences on quasiparticles and persistent strange metal behavior across doping levels.

Contribution

It provides new insights into the dominant interactions affecting quasiparticles and the persistence of strange metal behavior in overdoped cuprates.

Findings

Nodal quasiparticles are dominated by phonons.

Antinodal quasiparticles are influenced by spin fluctuations.

Strange metal behavior persists across the overdoped regime.

Abstract

We explore the electronic structure in the heavily overdoped regime of the single layer cuprate superconductor Bi1.74Pb0.38Sr1.88CuO6+delta. We found that the nodal quasiparticle behavior is dominated mostly by phonons, while the antinodal quasiparticle lineshape is dominated by spin fluctuations. Moreover, while long range spin fluctuations diminish at very high doping, the local magnetic fluctuations still dominate the quasiparticle dispersion, and the system exhibits a strange metal behavior in the entire overdoped regime.