Anomalous Doping Evolution of Superconductivity and Quasiparticle Interference in Bi2Sr2Ca2Cu3

Abstract

We use scanning tunneling microscopy to investigate Bi2Sr2Ca2Cu3O10+δ trilayer cuprates from the optimally doped to overdoped regime. We find that the two distinct superconducting gaps from the inner and outer CuO2 planes both decrease rapidly with doping, in sharp contrast to the nearly constant TC. Spectroscopic imaging reveals the absence of quasiparticle interference in the antinodal region of overdoped samples, showing an opposite trend to that in single-and double-layer compounds. We propose that the existence of two types of inequivalent CuO2 planes and the intricate interaction between them are responsible for these highly anomalous observations in trilayer cuprates.

Emergent normal fluid in the superconducting ground state of overdoped cuprates

“…Here the scattering mainly occurs between the hot spots of the banana-shaped equal-energy contours of the Bogoliubov quasiparticles 28 , 30 , 31 . With increasing doping levels, the Bogoliubov QPI is gradually weakened, as reported by earlier studies on overdoped cuprates 32 . For the slightly overdoped OD-28K sample in Fig.…”

Correlating the charge-transfer gap to the maximum transition temperature in Bi 2 Sr 2 Ca n -1 Cu n O 2 n +4+δ

“…Recent scanning tunneling microscopy (STM) studies ( 5 ) have shown that the superconducting gap of Bi-2223 decreases monotonously with p in the overdoped regime. Unexpectedly, the T c in this doping range exhibits a plateau rather than a continuous drop, most likely owing to the existence of two types of inequivalent CuO 2 planes ( 6 , 7 ). By contrast, the Bi-2223 system provides an ideal platform for investigating the evolution of T c,max with n and the physical parameters that control T c,max .…”