Investigation of Pairing Symmetry and Normal State Properties of Electron-Doped Copper Oxides

格林本实验研究项目是关于电子掺杂铜超导体的，重点研究了它们的配对对称性和正常态行为。R(2-x)Ce(x)CuO（4-y）族电子掺杂超导体，R=Nd,Pr,Sm,Eu，将以单晶和薄膜形式制备。该项目的目标是生产和表征最高质量的电子掺杂材料的单晶和薄膜，并进行全面的物理性质测量，为所有铜氧化物的超导性和异常正态提供可靠的实验约束理论。重点将放在测量上，以确定电子掺杂材料的超导态的配对对称性，并寻找“赝隙”的更明确的证据。预计将这些材料的性质与它们的空穴掺杂对应物进行详细的比较将对推进对铜氧化物的整体理解非常重要。该研究项目是跨学科的，涉及一名或多名博士后和研究生。这些参与为这些年轻的研究人员在工业、政府实验室或学术界的职业生涯提供了良好的准备。这个实验研究项目是关于“电子掺杂”铜高转变温度超导体家族的品种。在化学术语中，这些可以用公式R(2-x)Ce(x)CuO（4-y）来描述。这里的符号R代表一种稀土元素钕、镨、钐或铕；而Ce是铈，Cu是铜，O是氧。在这些材料中，导电被认为是“n型”或通过电子，而不是“p型”或通过正空穴，就像在传统的铜酸盐（如YBaCuO）中一样。这些材料具有基础和应用价值。研究人员将培养单晶和薄膜等材料的样品。该项目的目标是生产和表征最高质量的电子掺杂材料的单晶和薄膜，并进行全面的物理性质测量，为所有铜氧化物的超导性和异常正态提供可靠的实验约束理论。重点将放在测量上，以确定电子掺杂材料的超导态的配对对称性，并寻找“赝隙”的更明确的证据。预计将这些材料的性质与它们的空穴掺杂对应物进行详细的比较将对推进对铜氧化物的整体理解非常重要。该研究项目是跨学科的，涉及一名或多名博士后和研究生。这些参与为这些年轻的研究人员在工业、政府实验室或学术界的职业生涯提供了良好的准备。＊＊＊

w:\awards\awards96\*.doc 9732736 Greene This experimental research project is concerned with the electron- doped cuprate superconductors, with emphasis on their pairing symmetry and normal state behavior. Electron doped superconductors in the family R(2-x)Ce(x)CuO(4-y), with R=Nd,Pr,Sm,Eu, will be prepared in single crystal and thin film forms. The objectives of this project are to produce and characterize the highest quality single crystals and thin films of the electron-doped materials, and to perform comprehensive physical property measurements which can provide reliable experimental constraints on theories for the superconductivity and for the anomalous normal state in all the copper oxides. Emphasis will be given to measurements to definitively determine the pairing symmetry of the superconducting state of the electron doped materials and to search for more definitive evidence for a "pseudogap". It is expected that a detailed comparison of the properties of these materials with their hole-doped counterparts will be quite important in advancing the overall understanding of the copper oxides. This research program is interdisciplinary in nature and involves one or more postdoctoral and graduate students in its activities. These involvements provide excellent preparation of these young researchers for careers in industry, government laboratories or academia. %%% This experimental research project is concerned with the "electron-doped" varieties of the cuprate high transition temperature superconductor family. In chemical terms, these can be described by the formula R(2-x)Ce(x)CuO(4-y). Here the symbol R stands for one of the rare earth elements Neodymium, Praseodymium, Samarium, or Europium; while Ce is Cerium, Cu copper, and O oxygen. In these materials the electrical conduction is believed to be "n-type" or by electrons, rather than "p-type" or by positive holes, as in the conventional cuprates such as YBaCuO. These materials are of fundamental and applied interest.The researchers will grow samples of such materials as single crystals and as thin films. The objectives of this project are to produce and characterize the highest quality single crystals and thin films of the electron-doped materials, and to perform comprehensive physical property measurements which can provide reliable experimental constraints on theories for the superconductivity and for the anomalous normal state in all the copper oxides. Emphasis will be given to measurements to definitively determine the pairing symmetry of the superconducting state of the electron doped materials and to search for more definitive evidence for a "pseudogap". It is expected that a detailed comparison of the properties of these materials with their hole-doped counterparts will be quite important in advancing the overall understanding of the copper oxides.This research program is interdisciplinary in nature and involves one or more postdoctoral and graduate students in its activities. These involvements provide excellent preparation of these young researchers for careers in industry, government laboratories or academia. ***