Superconducting transition temperature enhancement in YBa2Cu3O7 by chemical substitution and the implications thereof for the upper critical magnetic field
- 12 October 1992
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 61 (15) , 1852-1854
- https://doi.org/10.1063/1.108395
Abstract
Chemical substitution of La+3 for Ba+2 in compounds of nominal composition YBa2−xLaxCu3O7−δ is shown to increase the superconducting transition temperature Tc by ∼2 K and the electrical resistivity ρ(100 K) by 90% for x=0.06. The increase of Tc is argued to result from a reduction of the hole carrier density. These results lead to the speculation that the upper critical magnetic field Hc2 may be increased by as much as 50% through this simple substitution.Keywords
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