Hybridization of Bogoliubov Quasiparticles between Adjacent CuO2 Layers in the Triple-Layer Cuprate Bi2Sr2Ca2Cu3O10+δ Studied by Angle-Resolved Photoemission Spectroscopy

Hybridization of Bogoliubov quasiparticles (BQPs) between the CuO2 layers in the triple-layer cuprate high-temperature superconductor Bi2Sr2Ca2Cu3O10+delta is studied by angle-resolved photoemission spectroscopy (ARPES). In the superconducting state, an anticrossing gap opens between the outer and inner-BQP bands, which we attribute primarily to interlayer single-particle hopping with possible contributions from interlayer Cooper pairing. We find that the d-wave superconducting gap of both BQP bands smoothly develops with momentum without an abrupt jump in contrast to a previous ARPES study. Hybridization between the BQPs also gradually increases in going from the off nodal to the antinodal region, which is explained by the momentum dependence of the interlayer single-particle hopping. As possible mechanisms for the enhancement of the superconducting transition temperature, the hybridization between the BQPs as well as the combination of phonon modes of the triple CuO2 layers and spin fluctuations represented by a four-well model are discussed.

Automated summary

The study investigates the hybridization of Bogoliubov quasiparticles (BQPs) between the CuO2 layers in a triple-layer cuprate high-temperature superconductor using angle-resolved photoemission spectroscopy (ARPES). It was found that an anticrossing gap opens between the outer and inner-BQP bands in the superconducting state, attributed to interlayer single-particle hopping with possible contributions from interlayer Cooper pairing. The d-wave superconducting gap of both BQP bands smoothly develops with momentum, and the hybridization between the BQPs gradually increases from the off nodal to the antinodal region, potentially contributing to the enhancement of the superconducting transition temperature.