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

Abstract

We have observed the bulk Fermi surface (FS) in an overdoped ($x$=0.3) single crystal of La${}_{2-x}$Sr${}_x$CuO${}_4$ by using Compton scattering. A two-dimensional (2D) momentum density reconstruction from measured Compton profiles yields a clear FS signature in the third Brillouin zone along [100]. The quantitative agreement between density functional theory (DFT) calculations and momentum density experiment suggests that Fermi-liquid physics is restored in the overdoped regime. In particular the predicted FS topology is found to be in good accord with the corresponding experimental data. We find similar quantitative agreement between the measured 2D angular correlation of positron annihilation radiation (2D-ACAR) spectra and the DFT based computations. However, 2D-ACAR does not give such a clear signature of the FS in the extended momentum space in either the theory or the experiment.

9 pages, 8 figures

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Cited by in corpus (5)

• Different doping from apical and planar oxygen vacancies in Ba${}_2$CuO${}_{4-\delta }$ and La${}_2$CuO${}_{4-\delta }$
• High-resolution Compton spectroscopy using X-ray microcalorimeters
• Fermi surface in La-based cuprate superconductors from Compton scattering imaging
• Quality of Heusler Single Crystals Examined by Depth Dependent Positron Annihilation Techniques
• Natural orbital functional theory and pairing correlation effects in electron momentum density