He, YangYin, YiZech, M.Soumyanarayanan, AnjanYee, Michael ManchunWilliams, Tess LawannaBoyer, M. C.Chatterjee, K.Wise, W. D.Zeljkovic, IlijaKondo, T.Takeuchi, T.Ikuta, H.Mistark, P.Markiewicz, R. S.Bansil, A.Sachdev, SubirHudson, E. W.Hoffman, Jenny2014-09-112014He, Y., Y. Yin, M. Zech, A. Soumyanarayanan, M. M. Yee, T. Williams, M. C. Boyer, et al. 2014. “Fermi Surface and Pseudogap Evolution in a Cuprate Superconductor.” Science 344, no. 6184: 608–611.0036-8075http://nrs.harvard.edu/urn-3:HUL.InstRepos:12841975The unclear relationship between cuprate superconductivity and the pseudogap state remains an impediment to understanding the high transition temperature (Tc) 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 Tc. Surprisingly, this major reorganization of the system’s underlying electronic structure has no effect on the smoothly evolving pseudogap.en-USJournal Article2014-08-08Yang He, Yi Yin, M. Zech, Anjan Soumyanarayanan, Michael M. Yee, Tess Williams, M. C. Boyer, Kamalesh Chatterjee, W. D. Wise, Ilija Zeljkovic, Takeshi Kondo, T. Takeuchi, H. Ikuta, Peter Mistark, Robert S. Markiewicz, Arun Bansil, Subir Sachdev, E. W. Hudson, Jennifer E. Hoffman10.1126/science.1248221