Metal-Insulator Transition and Superconductivity in Strongly Correlated Systems

本研究将探讨层状氧化铜材料（高tc体系）从金属超导态到绝缘有序磁态的转变。从几个原子层到几个单位细胞厚度的薄膜将通过多种方法生长和表征。通过改变激光烧蚀技术制备的材料的组成，可以改变其导电性能。当超导性随成分变化而消失时，将研究自旋涨落和磁序的演化。在与同事的合作下，这些材料将通过x射线和中子衍射以及电输运测量来表征。这个项目涉及高tc薄膜的生长和特性。一个主要的兴趣是超导性质如何改变或消失，随着薄膜的材料的原子生长。作者将使用结构和电学技术来表征薄膜材料，并研究材料的磁性和超导性之间的相互作用。这些结果对超导的基本方面以及在制备新的超导层状结构的背景下的技术相关性具有重要意义。＊＊＊

9305860 Lindenfeld This research will investigate the transition from the metallic, superconducting state to the insulating, magnetically ordered state in layered cuprate oxide materials, the high-Tc systems. Thin films from a few atom-layers to several unit cells in thickness will be grown and characterized by a number of methods. The conducting properties will be changed by varying the composition of the materials which are prepared by laser-ablation techniques. The evolution of spin fluctuations and magnetic order will be investigated as the superconductivity disappears with compositional changes. In collaboration with colleagues, the materials will be characterized by x-ray and neutron diffraction and electrical transport measurements. %%% This project deals with the growth and characterization of high-Tc films. A major interest is how the superconducting properties change or disappear as films of the materials are grown atom by atom. The authors will use structural and electrical techniques to characterize the thin film materials and investigate the interplay between magnetic and superconducting properties of the materials. The results have importance for fundamental aspects of superconductivity as well as technological relevance in the context of preparing new superconducting layered structures. ***