title: Fermi surface and pseudogap evolution in a cuprate superconductor.
abstract: The unclear relationship between cuprate superconductivity and the pseudogap state remains an impediment to understanding the high transition temperature (T(c)) superconducting mechanism. Here, we used magnetic field-dependent scanning tunneling microscopy to provide phase-sensitive proof that d-wave superconductivity coexists with the pseudogap on the antinodal Fermi surface of an overdoped cuprate. Furthermore, by tracking the hole-doping (p) dependence of the quasi-particle interference pattern within a single bismuth-based cuprate family, we observed a Fermi surface reconstruction slightly below optimal doping, indicating a zero-field quantum phase transition in notable proximity to the maximum superconducting T(c). Surprisingly, this major reorganization of the system's underlying electronic structure has no effect on the smoothly evolving pseudogap.
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: He
authors.forename: Yi
authors.initials: Y
authors.lastname: Yin
authors.forename: M
authors.initials: M
authors.lastname: Zech
authors.forename: Anjan
authors.initials: A
authors.lastname: Soumyanarayanan
authors.forename: Michael M
authors.initials: MM
authors.lastname: Yee
authors.forename: Tess
authors.initials: T
authors.lastname: Williams
authors.forename: M C
authors.initials: MC
authors.lastname: Boyer
authors.forename: Kamalesh
authors.initials: K
authors.lastname: Chatterjee
authors.forename: W D
authors.initials: WD
authors.lastname: Wise
authors.forename: I
authors.initials: I
authors.lastname: Zeljkovic
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kondo
authors.forename: T
authors.initials: T
authors.lastname: Takeuchi
authors.forename: H
authors.initials: H
authors.lastname: Ikuta
authors.forename: Peter
authors.initials: P
authors.lastname: Mistark
authors.forename: Robert S
authors.initials: RS
authors.lastname: Markiewicz
authors.forename: Arun
authors.initials: A
authors.lastname: Bansil
authors.forename: Subir
authors.initials: S
authors.lastname: Sachdev
authors.forename: E W
authors.initials: EW
authors.lastname: Hudson
authors.forename: J E
authors.initials: JE
authors.lastname: Hoffman