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Fermi Surface Pairing & Coherence in a High Tc Superconductor | Yang He
; Yi Yin
; M. Zech
; Anjan Soumyanarayanan
; Ilija Zeljkovic
; Michael M. Yee
; M. C. Boyer
; Kamalesh Chatterjee
; W. D. Wise
; Takeshi Kondo
; T. Takeuchi
; H. Ikuta
; Peter Mistark
; Robert S. Markiewicz
; Arun Bansil
; Subir Sachdev
; E. W. Hudson
; Jennifer. E. Hoffman
; | Date: |
13 May 2013 | Abstract: | Superconductivity arises from the pairing of electrons on the Fermi surface.
In high temperature cuprate superconductors, evidence compiled from several
materials suggests that the Fermi surface expands at a critical doping.
However, the nature of the altered Fermi surface, its availability for pairing,
and its relationship to the long-mysterious pseudogap phase are unknown. Here
we use scanning tunneling microscopy to reveal a quantum phase transition in
Fermi surface topology within a single material (PbxBi2-x)LaySr2-yCuO6+z
(Bi2201). In lightly doped samples, the Fermi surface terminates at the
antiferromagnetic Brillouin zone boundary, but upon increased doping we detect
a new Fermi surface component extending to the antinode. We use phase-sensitive
quasiparticle interference mapping to prove that d-wave Bogoliubov
quasiparticles exist on this recovered antinodal Fermi surface despite the
coexisting pseudogap. By magnetic-field-dependent imaging, we finally identify
the competitive role of the pseudogap: it inhomogeneously suppresses
superconducting phase coherence, while leaving a robust superconducting gap
intact. The discovery of these three phenomena within a single cuprate material
provides a new basis for understanding the phenomenology of high-Tc
superconductivity. | Source: | arXiv, 1305.2778 | Services: | Forum | Review | PDF | Favorites |
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