| 摘要 |
<p>Superconducting copper oxides of the perovskite structure are modified to have mixed occupancy of a cation site, thereby resulting in increased limits in critical field and/or critical current. Mixed occupancy may be observed in terms of increased resistivity as the superconducting material reverts to nonsuperconducting state. A significant advantage, at least for preferred compositions, derives from the fact that critical temperature is substantially unaffected relative to the prototypical material.</p> |
