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

9732736格林这个实验研究项目是关于电子掺杂的铜酸盐超导体，重点是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，将以单晶和薄膜的形式制备。本项目的目标是制备和表征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试，为超导电性和所有铜氧化物中的反常正常态提供可靠的实验约束。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，并寻找更确凿的证据来证明“假能隙”。预计，对这些材料与它们的空穴掺杂对应物的性能进行详细的比较将对促进对铜氧化物的整体理解非常重要。该研究项目本质上是跨学科的，有一名或多名博士后和研究生参与其中。这些参与为这些年轻研究人员在工业、政府实验室或学术界的职业生涯提供了极好的准备。这个实验研究项目涉及铜酸盐高转变温度超导体家族中的“电子掺杂”品种。用化学术语来说，它们可以用式R(2-x)Ce(X)CuO(4-y)来描述。这里的符号R代表稀土元素中的一种，即Ne、Pr、Sm或Eu；而Ce代表Ce、铜、铜和O氧。在这些材料中，导电被认为是“n型”或电子，而不是“p型”或正空穴，在传统的铜酸盐，如YBaCuO。这些材料具有基础和应用价值。研究人员将生长单晶和薄膜等材料的样品。本项目的目标是制备和表征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试，为超导电性和所有铜氧化物中的反常正常态提供可靠的实验约束。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，并寻找更确凿的证据来证明“假能隙”。预计这些材料与它们的空穴掺杂材料的性能的详细比较将对促进对氧化铜的全面了解非常重要。这项研究计划是跨学科的，涉及一名或多名博士后和研究生参与其活动。这些参与为这些年轻研究人员在工业、政府实验室或学术界的职业生涯提供了极好的准备。***

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. ***