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

电子掺杂氧化铜的配对对称性和正常态性质的研究

• 批准号: 9732736
• 负责人: richard greene
• 金额: $ 10.5万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-01 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9732736&HistoricalAwards=false
• 关键词: Investigation; Pairing; Symmetry; Normal; State

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. ***

w：\awards\awards96\*.doc 9732736格林 本实验研究计画系关于电子掺杂铜酸盐超导体，著重于其对对称性。 和 正常 状态 行为 电子 掺杂超导体 在 的 家庭 R（2-x）Ce（x）CuO（4-y）， 其中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，并进行全面的物理测试。 性能测量，可以提供 对所有铜氧化物的超导性和反常正常态理论的可靠实验约束。 重点将给予测量，以明确地确定电子掺杂材料的超导态的配对对称性，并寻找更明确的证据为“赝能隙”。 预计这些材料与其空穴掺杂对应物的性能的详细比较对于推进对氧化铜的全面理解将是非常重要的。该研究计划是跨学科的性质，涉及一个或多个博士后和研究生在其活动。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 实验研究项目涉及 铜酸盐的“电子掺杂”种类 高 转变温度超导体家族在化学术语中，这些可以通过式R（2-x）Ce（x）CuO（4-y）来描述。这里的符号R 站 对于稀土元素钕、镨、钐或铕中的一种;而Ce是铈，Cu铜， O氧气。 在这些材料中， 导电被认为是“n型”或通过电子，而不是“p型”或通过空穴，如在传统的铜酸盐如YBaCuO中。这些材料具有基础性和应用性，研究人员将把这些材料的样品培育成单晶和薄膜。该项目的目标是生产和表征电子掺杂材料的最高质量单晶和薄膜，并进行全面的物理性质测量，从而为所有氧化铜的超导性和异常正常态理论提供可靠的实验约束。 重点将放在测量上 明确地 确定 的 配对 对称 的 电子掺杂材料的超导状态，并寻找“赝能隙”的更明确的证据。 预计这些材料与空穴掺杂对应物的性质的详细比较将对推进对氧化铜的全面理解非常重要。该研究计划是跨学科的，涉及一个或多个博士后和研究生。 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。 ***