1999/08/12 by A. Rubio-Ponce, A. Rubio–Ponce, Rubio-Ponce, A. +2
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.cond-mat/9908179
8 Pages, 4 eps figures, sumitted to Phys. Rev. B
arxiv created 1999/08/12 · openalex publication_date 1999/08/12 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have reproduced band structure calculations from the literature and have used them to analyze in detail the energy landscape around the Fermi level. We found three Van Hove singularities, two below (-230, -54 meV) and one above the Fermi level (+27 meV). We have studied the composition of each one of them and found that states comming from the chain do contribute in a very importan way. The contribution from the planes are indeed important and, therefore, we find that a 2D description includes the most important contributions. Nevertheless, the contribution from states out of the planes (the chains and the apical oxygen) is by no means negligable. We find that it is possible that in YBaCuO part of the condensate lies in the chains, a fact that would agree with some recent evidences concerning PrBaCuO. Our general conclusion is that the 2D description of 123-compounds might be insuficient to explain all the experimental details and that a 3D description seems compulsory to fully account for the phenomenom of superconductivity in YBaCuO.