An Experimental Study of the Infrared Transmission Properties of High Temperature Superconducting Materials

这项研究涉及研究高温超导体的光传输特性，使用独立超薄单晶和布鲁克海文国家同步加速器光源提供的异常明亮的红外辐射。研究的主要部分将致力于样品制备和表征，包括在石溪进行的结构和运输测量。本研究的目的是阐明这些化合物中超导能隙的性质，并研究正常和超导状态下的光学活性元素激发。这些材料的光学反射率是不寻常的和复杂的，传输研究具有固有的优势，在低频下具有更好的精度。磁性和非磁性掺杂、辐照缺陷和不同程度缺氧的材料将被制备和研究。研究还将对传统超导体和准二维金属的参考样品进行研究。

This research involves the study of the optical transmission properties of high temperature superconductors, using free standing ultrathin single crystals and the exceptionally bright infrared radiation available at the National Synchrotron Light Source at Brookhaven. A major part of the research will be devoted to sample preparation and characterization, including structural and transport measurements carried out at Stony Brook. The objectives of the present investigation are to elucidate the nature of the superconducting energy gap in these compounds, and to study the optically active elementary excitations in the normal and superconducting states. The optical reflectivity of these materials is unusual and complex and transmission studies have an inherent advantage of better accuracy at low frequencies. Materials with magnetic and non-magnetic dopants, with irradiation induced defects, and with various level of oxygen deficiency will be prepared and investigated. Studies will also be made of reference samples of conventional superconductors and quasi two- dimensional metals.