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Title: Direct Spectroscopic Evidence for Phase Competition between the Pseudogap and Superconductivity in Bi2Sr2CaCu2O8+δ

In the high-temperature (Tc) cuprate superconductors, increasing evidence suggests that the pseudogap, existing below the pseudogap temperature T*, has a distinct broken electronic symmetry from that of superconductivity. Particularly, recent scattering experiments on the underdoped cuprates have suggested that a charge ordering competes with superconductivity. However, no direct link of this physics and the important low-energy excitations has been identified. We report an antagonistic singularity at Tc in the spectral weight of Bi2Sr2CaCu2O8+δ as a compelling evidence for phase competition, which persists up to a high hole concentration p ~ 0.22. Comparison with a theoretical calculation confirms that the singularity is a signature of competition between the order parameters for the pseudogap and superconductivity. Our 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 intertwined phases and the complex phase diagram near the pseudogap critical point.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [2] ;  [5] ;  [1] ;  [1] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [10] ;  [6] ;  [11] ;  [1] ;  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of North Dakota, Grand Forks, ND (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States); Osaka Univ. (Japan)
  6. National Institute of Advanced Industrial Science and Technology, Tsukuba (Japan)
  7. National Institute of Advanced Industrial Science and Technology, Tsukuba (Japan); Japan Atomic Energy Agency, Tokai (Japan)
  8. Tokyo Inst. of Technology (Japan)
  9. Univ. of Tokyo (Japan); Cornell Univ., Ithaca, NY (United States)
  10. Univ. of Tokyo (Japan)
  11. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
OSTI Identifier:
1228740
Report Number(s):
SLAC-PUB--16431
Journal ID: ISSN 1476-1122; arXiv:1405.5199
DOE Contract Number:
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Materials; Journal Volume: 14
Publisher:
Nature Publishing Group
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
US DOE Office of Science (DOE SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE MATSCI; electronic properties and materials; superconducting properties and materials