Model Studies of Exotic Superconductivity in Heavy Fermion Materials

重费米子材料中奇异超导性的模型研究

• 批准号: 9420920
• 负责人: Daniel Cox
• 金额: $ 16.5万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-01-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9420920&HistoricalAwards=false
• 关键词: Model; Studies; Exotic; Superconductivity; Heavy

9420920 Cox This project addresses two pressing theoretical questions in the area of superconducitivity. First, what is the origin of superconductivity in the heavy fermion materials? Second, can the odd-in-time reversal Cooper pair really be found in a physical system? To address these questions, superconductivity in the heavy fermion materials will be studied using a variety of techniques based upon the primary assumption that it arises from odd-in-time-reversal Cooper pairs whose microscopic origin is in the two-channel Kondo model using a variety of techniques. Effects of doping, disorder, and symmetry breaking fields will be studied as well. Several phenomenological approaches will also be attempted. This study should answer definitely whether the two-channel Kondo model is a viable candidate for a comprehensive theory of heavy fermion superconductivity and whether odd-in-time-reversal pairing may have a solid basis in these materials. %%% In this work a variety of theoretical techniques is used to study a class of materials known as heavy fermion materials. In some ways these materials act as if the electrons have a much larger mass than an isolated electron. These materials are of special interest because at low temperatures they superconduct in a way that cannot be understood using the traditional theory of superconductivity. Here a particular model will be studied to see if it agrees with the known properties of heavy fermion superconductors. Understanding superconductivity in these materials should contribute to the theory of superconductivity in high temperature superconductors, with the ultimate goal of being able to design materials which are superconducting at higher and higher temperatures. ***

9420920 COX这个项目解决了两个迫切的理论问题。 首先，重型费米昂材料中超导性的起源是什么？ 其次，可以在物理系统中真正找到奇怪的逆转库珀对吗？ 为了解决这些问题，将使用多种技术基于主要假设来研究重型费米昂材料中的超导性，即它是由奇怪的时期反转库珀对产生的，其微观起源是使用各种技术的两通道近型模型中的。 还将研究掺杂，混乱和对称性断裂场的影响。 还将尝试几种现象学方法。 这项研究应绝对回答两道通道近藤模型是否是综合效率超导性的综合理论的可行候选者，以及奇怪的时期反转配对是否可以在这些材料中具有牢固的基础。 在这项工作中，使用各种理论技术来研究一类称为重型费米昂材料的材料。 在某些方面，这些材料的作用好像电子的质量比孤立的电子大得多。 这些材料具有特殊的兴趣，因为在低温下它们以无法使用传统的超导性理论来理解的方式。 在这里，将研究一个特定的模型，以查看它是否符合重型费米昂超导体的已知特性。 了解这些材料中的超导性应有助于高温超导体中的超导性理论，最终的目的是能够设计在较高和较高温度下超导的材料。 ***