摘要在我们现在已知的超导化合物中，可以说很大一部分的材料的晶体结构都具有镜面对称，即存在对称中心。同时受泡利不相容原理（在轨道量子数确定的一个原子轨道上最多只能容纳两个电子，并且它们的自旋方向相反。）和左右交换宇称交换的反对称性的限制，超导电子对给出的波函数如果不是自旋单态，那么就是自旋三重态。而当超导体的中心对称破缺以后，其非对称的晶体势场就会产生一种反对称的自旋—轨道耦合 (an-tisymmetric spin-orbit coupling，ASOC) 这种反对称的自旋—轨道耦合作用可以看成既具有自旋涨落，又具有中心反演对称性破缺的效应。89980

在本论文中，我主要围绕非中心对称超导体展开研究，重点研究以铼铪化合物为实验材料的超导电性及其数据参量和物理效应，同时对论文的内容作出简介的描述。主要研究如下：

第一章 绪论首先讲述超导体的概念和发展历程，详细介绍了超导体的基本原理和目前的发展程度。同时对论文的内容作出简介的描述。

第二章 非中心对称的涵义：本章主要解释了非中心对称的概念，讲述了几种主要的非中心对称超导体的基本理论以及我们所要研究的化合物的性质。如自旋轨道耦合，中心反演，单态和三重态混合。

第三章 实验方法、过程、数据分析等。该段主要讲我们如何进行我们的实验研究，在这过程中有用到哪些实验仪器（比如说XRD衍射仪）和我们所需要的理论。

Abstract In the superconducting compounds we now know, we can say that a large part of the crystal structure of the material has a mirror symmetry, that is, the existence of symmetry center。 At the same time by the Pauli exclusion principle (an atom orbit determination in orbit quantum number can hold up to two electrons and the spin direction are opposite。) About the exchange and exchange parity antisymmetric constraints, the wave function of the superconducting electrons if not spin singlet triplet spin, it is three。 When the central symmetry of the superconductor is broken, the asymmetric crystal potential field will produce a kind of antisymmetric spin orbit coupling (an-tisymmetric spin-orbit Coupling, ASOC) the antisymmetric spin orbit coupling effect can be seen as both the spin fluctuation and the central inversion symmetry breaking effect。

In this thesis, I mainly focus on the research of non centrosymmetric superconductors, focusing on Rhenium hafnium compounds as the experimental materials of superconductivity and its data parameters and physical effects, and the contents of the paper made brief description。 The main research is as follows:源Q于W优E尔A论S文R网wwW.yOueRw.com 原文+QQ75201,8766

In Chapter 1, we introduce the concept and development of superconductor, and introduce the basic principle and the development of superconductor。 At the same time, the paper gives a brief description of the content。

The second chapter is about the meaning of non centrosymmetric: this chapter mainly explains the concept of non centrosymmetric, describes the basic theory of several kinds of main non centrosymmetric superconductors and the properties of the compounds we want to study。 Spin orbit coupling, central inversion, singlet and three state mixing。

The third chapter is experimental method, process, data analysis and so on。 This section focuses on how we conduct our experimental studies, and what kinds of experimental instruments (such as the XRD diffractometer) are available in the process and what we need。

目录

第一章 引言 4

第一节 超导起源：来自优Y尔L论W文Q网wWw.YouERw.com 加QQ7520~18766 低温超导的开端