| 摘要 |
<p>Improved superconducting materials are described in which magnetic flux pinning is used to pin flux vortices in the superconducting materials, thereby allowing these materials to conduct large critical currents Ic having a magnitude of at least 10<4>A/cm<2> at 77K. Magnetic pinning sites can be obtained by the inclusion in the superconducting material of atoms exhibiting a magnetic moment, the number of atoms incorporated in the superconductor being sufficient to provide substantial vortex pinning in the superconductor. Further, the magnetic pinning sites must be distributed randomly in the superconductor to accomplish this effect. This type of vortex pinning is accomplished in superconductors having low values of coherence length, such as the high-Tc oxide superconductors, for example, YBa2Cu3Ox.</p> |
