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

16th International Conference on Positron Annihilation

Barbiellini, Bernardo^1

Department of Physics, Northeastern University, Boston, MA 02115, United States^1

关键词: High-temperature cuprate superconductors;    High-temperature superconductivity;    La2-xSrxCuO4;    La2CuO4;    Momentum density;    Momentum spaces;    Overdoped;    Oxygen defect;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012009/pdf
DOI  :  10.1088/1742-6596/443/1/012009

来源: IOP

【 摘 要 】

The bulk Fermi surface in an overdoped (x = 0.3) single crystal of La2-xSrxCuO4has 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.