Preparation and Physical Properties of Single Crystals and Thin Films of Neodimium Cerium Copper Oxides and Related Copper Oxides

9510475格林该项目的目标是制备和表征高质量的钕-铈-铜-氧（NCCO）单晶和薄膜以及镧-锶-铜-氧（LSCO）薄膜。 将进行全面的物理性质测量，目的是为铜氧化物的高温超导性和异常正常状态性质的理论提供可靠的实验约束。将对电子掺杂的NCCO系统和空穴掺杂的LSCO系统进行详细比较，以便更好地理解当铈、锶或氧组成改变时绝缘相、金属相和超导相之间的转变。 许多氧化铜材料在液氮沸点（77 K）以上的温度下是超导体，具有应用潜力。 然而，为什么这些材料在如此高的温度下是超导体，目前还缺乏理解。 本计画的目标是以改良的方法来制备及表征某些氧化铜超导体。 预计这将导致更好地了解这些材料的工作原理，并希望了解如何制备更适合技术应用的材料。 ***

9510475 Greene This project has as its goal the preparation and characterization of high quality neodymium-cerium- copper- oxygen (NCCO) single crystals and thin films and lanthanum-strontium-copper-oxygen (LSCO) thin films. Comprehensive physical property measurements will be carried out with the aim of providing reliable experimental constraints on the theories for high temperature superconductivity and anomalous normal state properties of copper oxides. A detailed comparison of the electron- doped NCCO system and the hole-doped LSCO system will be made in order to better understand the transition between insulating, metallic and superconducting phases as the cerium, strontium, or oxygen composition is changed. %%% Many copper oxide materials are superconductors at temperatures above the boiling point of liquid nitrogen (77K) and have potential for applications. However, an understanding of why these materials are superconductors at such high temperatures is lacking at present. The goal of this project is to prepare and characterize some selected copper oxide superconductors by improved methods. This is expected to lead to a better understanding of how these materials work, and hopefully, to insights on how to prepare materials which are better for technological applications. ***