Abstract
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.
Keywords
FS, momentum density, Compton profiles, Fermi-liquid physics, La₂₋ₓSrₓCuO₄
Subject Categories
Fermi surfaces, Astronomical spectroscopy
Disciplines
Condensed Matter Physics | Physics
Publisher
American Physical Society
Publication Date
5-10-2012
Rights Information
Copyright (2012) American Physical Society.
Rights Holder
American Physical Society
Recommended Citation
Al-Sawai, W.; Barbiellini, B.; Sakurai, Y.; Itou, M.; Mijnarends, P. E.; Markiewicz, R. S.; Kaprzyk, S.; Wakimoto, S.; Fujita, M.; Basak, S.; Lin, H.; Wang, Yung Jui; Eijt, S. W. H.; Schut, H.; Yamada, K.; and Bansil, A., "Bulk Fermi surface and momentum density in heavily doped La₂₋ₓSrₓCuO₄ using high-resolution Compton scattering and positron annihilation spectroscopies" (2012). Physics Faculty Publications. Paper 522.
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Notes
Originally published in Physical Review B v.85 (2012): 115109. DOI: 10.1103/PhysRevB.85.115109