Electronic Structure and Fermiology of High-Tc Superconductors |
| A. Bansil Department of Physics, Northeastern University, Boston, MA 02115, USA and S. Kaprzyk Institute of Physics and Nuclear Techniques, AGH, Al. Mickiewicza 30, 30-059 Kraków, Poland |
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| We briefly discuss some of our recent results in three areas, all related to issues concerning the electronic structure and fermiology of the high-Tc's. (i) First-principles band theory based computations of the electron-positron momentum density relevant for the interpretation of the positron annihilation (2D-ACAR) experiments; results for YBa2Cu3O7 are discussed. (ii) Another k-resolved spectroscopy where such first-principles comparisons between the computed and measured spectral intensities have been crucially important is the angle-resolved photoemission experiment; we discuss results for the (001)-surface of YBa2Cu3O7 where computations yield considerable insight into the nature and origin of the spectral signal associated with the CuO2 plane bands. (iii) The study of effects of substitutions and of oxygen-vacancy disorder in the high-Tc's; here results for the LaSrCuO4, and Ba-K-Bi-O and Ba-Pb-Bi-O systems, with focus on the nature of the van Hove singularity in the vicinity of the Fermi energy are presented. |
| DOI: 10.12693/APhysPolA.84.7 PACS numbers: 71.25.-s, 74.20.Mn, 74.25.Jb |