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 Greene这个实验研究项目与电子铜层超导体有关，重点是它们的配对对称性和正常状态行为。 r = nd，pr，sm，eu，将以单晶和薄膜形式制备r = nd，pr，sm，eu的家族R（2-X）CE（4-Y）中的电子掺杂超导体。 该项目的目标是生产和表征电子掺杂材料的最高质量的单晶和薄膜，并执行全面的物理性能测量结果，这些测量可以为所有铜氧化物中的超导性和异常正常状态提供可靠的实验约束。 将重点放在测量中，以确定确定电子掺杂材料的超导状态的配对对称性，并为“伪PSEUDOGAP”寻找更确定的证据。 可以预期，这些材料的性质与孔掺杂的对应物的详细比较对于促进对铜氧化物的整体理解非常重要。该研究计划本质上是跨学科的，涉及一个或多个博士后和研究生的活动。这些参与为这些年轻的研究人员提供了精美的准备，以为工业，政府实验室或学术界的职业做准备。 %% %%这个实验研究项目与Cuprate高过渡温度超导体家族的“电子掺杂”品种有关。用化学术语，可以通过公式R（2-X）CE（x）CuO（4-Y）来描述这些。在这里，符号r代表了稀土元素元素，praseodymium，samarium或europium之一。 CE是铜，Cu铜和O氧。 在这些材料中，电传导被认为是“ N型”或电子，而不是“ P型”或正孔，如Ybacuo等传统丘陵中所示。这些材料具有基本的兴趣和应用的兴趣。研究人员将种植诸如单晶和薄膜等材料的样品。该项目的目标是生产和表征电子掺杂材料的最高质量的单晶和薄膜，并执行全面的物理性能测量结果，这些测量可以为所有铜氧化物中的超导性和异常正常状态提供可靠的实验约束。 将重点放在测量中，以确定确定电子掺杂材料的超导状态的配对对称性，并为“伪PSEUDOGAP”寻找更确定的证据。 可以预期，这些材料的性质与孔掺杂的对应物的详细比较对于促进对铜氧化物的整体理解非常重要。该研究计划本质上是跨学科的，并且涉及一个或多个在其活动中的博士后和研究生。 这些参与为这些年轻的研究人员提供了精美的准备，以为工业，政府实验室或学术界的职业做准备。 ***