Loss of nodal quasiparticle integrity in underdoped YBa2Cu3O6+x

2010/07/22 by D. Fournier, G. Levy, Y. Pennec +11
Materials Science · Medicine · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Magnetic and transport properties of perovskites and related materials #Medicine #NODAL #Physics #Physics of Superconductivity and Magnetism #Quasiparticle #Superconductivity #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1038/nphys1763

published as Nature Physics 6, 905 (2010) · Nature Physics, in press. A high-resolution version can be found at http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/YBCO_Z.pdf

arxiv created 2010/07/22 · openalex publication_date 2010/10/10 · arxiv updated 2015/05/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Arguably the most intriguing aspect of the physics of cuprates is the close proximity between the record high-Tc superconductivity (HTSC) and the antiferromagnetic charge-transfer insulating state driven by Mott-like electron correlations. These are responsible for the intimate connection between high and low-energy scale physics, and their key role in the mechanism of HTSC was conjectured very early on. More recently, the detection of quantum oscillations in high-magnetic field experiments on YBa2Cu3O6+x (YBCO) has suggested the existence of a Fermi surface of well-defined quasiparticles in underdoped cuprates, lending support to the alternative proposal that HTSC might emerge from a Fermi liquid across the whole cuprate phase diagram. Discriminating between these orthogonal scenarios hinges on the quantitative determination of the elusive quasiparticle weight Z, over a wide range of hole-doping p. By means of angle-resolved photoemission spectroscopy (ARPES) on in situ doped YBCO, and following the evolution of bilayer band-splitting, we show that the overdoped metal electronic structure (0.25<p<0.37) is in remarkable agreement with density functional theory and the Z=2p/(p+1) mean-field prediction. Below p~0.10-0.15, we observe the vanishing of the nodal quasiparticle weight Z_N; this marks a clear departure from Fermi liquid behaviour and -- consistent with dynamical mean-field theory -- is even a more rapid crossover to the Mott physics than expected for the doped resonating valence bond (RVB) spin liquid.

Citations

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