We have observed the bulk Fermi surface (FS) in an overdoped (x=0.3) single crystal of La₂₋ₓSrₓCuO₄ 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.


Originally published in Physical Review B v.85 (2012): 115109. DOI: 10.1103/PhysRevB.85.115109


FS, momentum density, Compton profiles, Fermi-liquid physics, La₂₋ₓSrₓCuO₄

Subject Categories

Fermi surfaces, Astronomical spectroscopy


Condensed Matter Physics | Physics


American Physical Society

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Copyright (2012) American Physical Society.

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American Physical Society

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