title: Direct spectroscopic evidence for phase competition between the pseudogap and superconductivity in Bi2Sr2CaCu2O(8+δ).
abstract: In the high-temperature (T(c)) cuprate superconductors, a growing body of evidence suggests that the pseudogap phase, existing below the pseudogap temperature T*, is characterized by some broken electronic symmetries distinct from those associated with superconductivity. In particular, recent scattering experiments have suggested that charge ordering competes with superconductivity. However, no direct link of an interplay between the two phases has been identified from the important low-energy excitations. Here, we report an antagonistic singularity at T(c) in the spectral weight of Bi2Sr2CaCu2O(8+δ) as compelling evidence for phase competition, which persists up to a high hole concentration p ~ 0.22. Comparison with theoretical calculations confirms that the singularity is a signature of competition between the order parameters for the pseudogap and superconductivity. The observation of the spectroscopic singularity at finite temperatures over a wide doping range provides new insights into the nature of the competitive interplay between the two orders and the complex phase diagram near the pseudogap critical point.
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: Makoto
authors.initials: M
authors.lastname: Hashimoto
authors.affiliation: 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA [3] Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Nowadnick
authors.affiliation: 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA [3] Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA [4] Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Rui-Hua
authors.initials: RH
authors.lastname: He
authors.affiliation: 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA [3] Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Inna M
authors.initials: IM
authors.lastname: Vishik
authors.affiliation: 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA.
authors.forename: Brian
authors.initials: B
authors.lastname: Moritz
authors.affiliation: 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA [3] Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: He
authors.affiliation: 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA [3] Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA [4] Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Kiyohisa
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: 1] Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: Robert G
authors.initials: RG
authors.lastname: Moore
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: Donghui
authors.initials: D
authors.lastname: Lu
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Yoshida
authors.affiliation: 1] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan [2] Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Ishikado
authors.affiliation: Materials and Structures Laboratory, Tokyo institute of Technology, Yokohama, Kanagawa 226-8503, Japan.
authors.forename: Takao
authors.initials: T
authors.lastname: Sasagawa
authors.affiliation: 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] Laboratory for Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Fujita
authors.affiliation: Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Ishida
authors.affiliation: Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Uchida
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Eisaki
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Zahid
authors.initials: Z
authors.lastname: Hussain
authors.affiliation: 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Devereaux
authors.affiliation: 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA [3] Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Zhi-Xun
authors.initials: ZX
authors.lastname: Shen