NSF/ONR: Proximity Effects, Tunneling and Spin-Injection in Yttrium-Barium-Copper-Oxide Films as a Function of Crystallographic Orientation

摘要：这是一个实验研究项目，旨在测量高温超导体界面上的电子和自旋输运作为晶体取向的函数。高质量的钇钡铜氧化物超导薄膜以四种不同的晶体取向在原位生长，并在大多数情况下与正常金属（超导转变温度以上的超导体），绝缘体和铁磁性金属分层。我们的主要目标是确定这些材料中邻近效应的存在和大小，进行邻近电子隧道能谱以扩展我们对固有间隙参数特性的认识，并研究超导界面上的自旋输运。后一种测量将与华盛顿特区海军研究实验室的科学家合作进行。技术摘要：这是一个实验研究项目，旨在测量高温超导体界面上的电子和自旋输运。这些实验将在高温超导体钇钡铜氧化物的四种不同晶体取向上进行。高质量、晶体取向的超导薄膜是用各种材料生长和分层的，包括绝缘体、普通金属和磁性材料。我们的主要目标是了解超导对泄漏到并置的正常金属中，确定固有超导状态的细节，并测量超导界面上的自旋输运。自旋注入实验将与海军研究实验室的科学家合作完成。＊＊＊

9421957 Greene Non-Technical Abstract: This is an experimental research project directed at measuring electronic and spin transport across interfaces to high-temperature superconductors as a function of crystallographic orientation. High-quality, superconducting films of yttrium-barium-copper-oxide are grown in-situ in four different crystallographic orientations, and layered, in most cases in-situ, with normal metals ( superconductors above their superconducting transition temperature), insulators and ferromagnetic metals. Our primary goals are to establish the existence and magnitude of a proximity effect in these materials, perform proximity electron tunneling spectroscopy to extend our knowledge of the intrinsic gap parameter properties and to study the spin transport across the superconducting interface. The latter measurements will be performed in collaboration with scientists at the Naval Research Laboratory, Washington, D. C. %%% Technical Abstract: This is an experimental research project directed at measuring electronic and spin transport across interfaces to high-temperature superconductors. These experiments will be performed on four different crystallographic orientations of the high-temperature superconductor yttrium- barium-copper-oxide. High-quality, crystallographically oriented superconducting films are grown and layered with a variety of materials, including insulators, normal metals and magnetic materials. Our primary goals are to understand the leakage of superconducting pairs into a juxtaposed normal metal, determine details of the intrinsic superconducting state and to measure spin transport across the superconducting interface. The spin injection experiments will be done in collaboration with scientists at the Naval Research Laboratory. ***