ISSN:
1573-8779
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Conclusions Cluster calculations show that there is oxygen stabilization in the copper-oxygen chains in Y1Ba2Cu4O8 on account of the lower excess negative charge on the oxygen and the presence of an additional Cu−O bond together with geminal O...O and Cu...Cu interactions. No basis is found for possible high TC for YBa2Cu4O3.5 and YBa2Cu5O9. The mechanisms that raise TC on compressing YBa2Cu4O8 or doping it with calcium are identical and mount to incrase in the state density at the Fermi level because there is stronger interaction between the copper-oxygen plane and the chain on account of the strengthening of the bonds joining them and the bonding involving barium or calcium. Lattice compression also favors this. This study has been performed within the framework of the ANOKONDA project under the State High-Temperature Superconductivity program.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00745600
