The bulk Fermi surface in an overdoped (x=0.3) single crystal of La2−xSrxCuO4 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 La2CuO4. 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.
@article{arxiv.1306.6094,
title = {High-temperature cuprate superconductors studied by x-ray Compton scattering and positron annihilation spectroscopies},
author = {Bernardo Barbiellini},
journal= {arXiv preprint arXiv:1306.6094},
year = {2013}
}
Comments
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