Further Establishment of the Field Perturbation Theory of the Pseudogaps in HTSC

Here I establish the field perturbation theory of pseudogaps in HTSC. The proposed ground state suggests an internal particle-hole field, which is normal to nesting surfaces, and having twice the Fermi wave number. It is proved that the system violates momentum conservation by the wave vector of this internal field. This violation applies to the quasi-particle propagators, as well as to the interactions. Interaction vertices via the Pauli matrix-τ₁ are established. This, in turn, establishes the validity of the pseudogap Hartree self-energy.     

The Breakdown of Migdal's Theorem and the Divergence of Electron Polarizations in HTSC

We assume that Fermi surface nesting is a common feature in all oxide high temperature superconductors (HTSC) of perovskite or layered-perovskite structure. We show that this feature results in the breakdown of the Migdal's theorem, and the singularity of some electronic polarizations. These singularities trigger various kinds of instabilities in these materials.     

高温超导薄膜YBa2Cu3O6.5正常态电荷传输特性研究

介绍了50T左右脉冲强磁场的实验技术,诸如脉冲磁体设计、实验探针设计及测量线路设计等.随后,对高温超导薄膜YBa2Cu3O6.5在强磁场中的磁阻进行了实验研究.进而揭示正常态时超导薄膜YBa2Cu3O6.5随温度降低展现由导体向绝缘体的过渡过程.     

Controlled Modifications of HTSC Thin-Film Properties by Tailoring Substrate Surfaces

This chapter introduces the use of substrates for high-temperature superconductor (HTSC) thin-film deposition beyond their usual purpose as chemically inert, lattice-matched support for the films. Substrates are used as functional elements in order to controllably modify the growth mode of YBa₂Cu₃O_7–x thin films in the case of vicinal-cut SrTiO₃ single crystals or to locally modify the surface morphology and film/substrate lattice mismatch in the case of ion implanted SrTiO₃. Furthermore, the use of biaxial epitaxial strain is briefly reviewed for HTSC thin films, and the application of this concept to tailor the properties of perovskite thin films in general is shown.     

多通道相位一致性高温超导滤波器组

利用高温超导薄膜材料的低插损特性,实现了具有相位一致性的新型高温超导高性能三通道滤波器组,该器件置于接收机前端系统的低噪声放大器前可以使接收机前端系统同时具有带外抗干扰特性和带内低损耗特性,并具有极高的灵敏度。     

高温超导磁浮模型车的实验研究

本语文简要地介绍了一辆永磁型高温超导磁浮模型车的结构,分析了不同冷却间隙时的悬浮力,导向车的试验曲线以及直线电机定子绕组电流波形。根据试验分析结果,作者提出了一种电磁型高温超导磁浮模型车的结构 。     

直接冷却中高温超导电流引线的传热研究

降低高温超导电流引线向低温环境的漏热,以及实现电流引线与制冷机冷头导热不导电的直接接触冷却,是制冷机直接冷却超导系统走向应用的关键技术之一。本文提出了高温超导电流引线的基本结构,并对进入制冷机一、二级冷头的漏热进行了理论推导和数值模拟计算。     

高温超导磁悬浮模型车驱动性能的分析

本文简要地介绍了一辆高温超导磁悬浮模型车的结构,利用解析法,分析了直线电机的磁场分布,推导出驱动系统的驱动力,功率因素和效率的一般表达式。