High-temperature cuprate superconductors studied by x-ray Compton scattering and positron annihilation spectroscopies

Abstract

The bulk Fermi surface in an overdoped ($x=0.3$) single crystal of La${}_{2-x}$Sr${}_x$CuO${}_4$ has been observed by using x-ray Compton scattering. This momentum density technique also provides a powerful tool for directly seeing what the dopant Sr atoms are doing to the electronic structure of La${}_2$CuO${}_4$. Because of wave function effects, positron annihilation spectroscopy does not yield a strong signature of the Fermi surface in extended momentum space, but it can be used to explore the role of oxygen defects in the reservoir layers for promoting high temperature superconductivity.

Invited talk presented at the 16th International Conference on Positron Annihilation (ICPA-16) held at the University of Bristol, United Kingdom during the period of 19-24 August, 2012

References in corpus (6)

• Scale-free structural organization of oxygen interstitials in La2CuO4+y
• Different doping from apical and planar oxygen vacancies in Ba${}_2$CuO${}_{4-\delta }$ and La${}_2$CuO${}_{4-\delta }$
• The Resonating-Valence-Bond Ground State of Li Nanoclusters
• Bulk Fermi surface and momentum density in heavily doped La${}_{2-x}$Sr${}_x$CuO${}_4$ using high resolution Compton scattering and positron annihilation spectroscopies
• Lindhard and RPA susceptibility computations in extended momentum space in electron doped cuprates
• Enhancement of Compton Scattering by an Effective Coupling Constant

Cited by in corpus (1)

• Proposed parameter-free model for interpreting the measured positron annihilation spectra of materials using a generalized gradient approximation