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28 March 2024
 
  » arxiv » 1305.2778

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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
AbstractSuperconductivity 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
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