Advanced Superconducting Materials and Device Concepts.

摘要

The properties of advanced materials and phenomena basic to the development of new and/or improved superconducting electronic technologies were studied. These include the conducting magnetic oxide strontium ruthenate relevant to high-temperature Josephson devices, the doped magnetic oxide lanthanum manganate relevant to magnetic sensing, and scanning tunneling microscopy of the superconducting energy gap in the high-temperature superconductors. We found that the transport properties of strontium ruthenate cannot be understood using the conventional theory of metals, that the spin polarized of 72% in tunnel junctions incorporating doped lanthanum manganate, and that there are intrinsic inhomogeneities in the superconducting energy gap of the high temperature superconductors on mesoscopic length scales.