To elucidate the superconductor to metal transition at the end of
superconducting dome, the overdoped regime has stepped onto the center stage of
cuprate research recently. Here, we use scanning tunneling microscopy to
investigate the atomic-scale electronic structure of overdoped trilayer Bi-2223
and bilayer Bi-2212 cuprates. At low energies the spectroscopic maps are well
described by dispersive quasiparticle interference patterns. However, as the
bias increases to the superconducting coherence peak energy, a virtually
non-dispersive pattern with sqrt(2)*sqrt(2) periodicity emerges. Remarkably,
the position of the coherence peaks exhibits evident particle-hole asymmetry
which also modulates with the same period. We propose that this is an extreme
quasiparticle interference phenomenon, caused by pairing-breaking scattering
between flat anti-nodal Bogoliubov bands, which is ultimately responsible for
the superconductor to metal transition.Comment: 15 pages, 4 figure

Cai, Peng

Gao, Qiang

Hao, Zhenqi

Lee, Dung-Hai

Li, Xintong

Lin, Chengtian

Luo, Xiangyu

Wang, Yayu

Xu, Miao

Ye, Shusen

Zhou, Xingjiang

Zou, Changwei

English

arXiv

As doping increases in cuprate superconductors, the superconducting transition temperature increases to a maximum at the so-called optimal doping, and then decreases in the overdoped regime. In the past few decades, research has primarily focused on the underdoped and optimally doped regions of the phase diagram. Here, phenomena such as the pseudogap and strange metal non-superconducting states make it difficult to determine the superconducting pairing mechanism. More recently, experiments have shown unconventional behaviour in strongly overdoped cuprates, in both the normal and superconducting states. However, a real-space investigation of the unconventional superconductivity in the absence of the pseudogap is lacking, and the superconductor-to-metal phase transition in the overdoped regime remains controversial. Here we use scanning tunnelling microscopy to investigate the atomic-scale electronic structure of overdoped Bi2Sr2Can − 1CunO2n + 4 + δ cuprates. We show that, at low energies, the spectroscopic maps are well described by dispersive d-wave quasiparticle interference patterns. However, as the bias increases to the superconducting coherence peak energy, a periodic and non-dispersive pattern emerges. The position of the coherence peaks exhibits particle–hole asymmetry that modulates with the same period. We propose that this behaviour is due to quasiparticle interference caused by pair-breaking scattering between flat antinodal Bogoliubov bands

eScholarship - University of California

Particle–hole asymmetric superconducting coherence peaks in overdoped cuprates

arXiv.org e-Print Archive

Particle-hole asymmetric superconducting coherence peaks in overdoped
  cuprates

Particle-hole asymmetric superconducting coherence peaks in overdoped cuprates

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