YBCO超导体中含氧量的测定

ＹＢＣＯ超导体中含氧量和它的超导性有很大关系。本文用氢溴酸溶样，加柠檬酸盐与ＣＵ２＋生成配合物，然后用碘量法测含氧量，取得较好结果．     

Superconductivity in the non-magnetic state of iron under pressure.

Ferromagnetism and superconductivity are thought to compete in conventional superconductors, although in principle it is possible for any metal to become a superconductor in its non-magnetic state at a sufficiently low temperature. At pressures above 10 GPa, iron is known to transform to a non-magnetic structure and the possibility of superconductivity in this state has been predicted. Here we report that iron does indeed become superconducting at temperatures below 2 K at pressures between 15 and 30 GPa. The transition to the superconducting state is confirmed by both a drop in resistivity and observation of the Meissner effect.     

Bi系超导体工艺研究

本文叙述了Ｂｉ系高温超导体的工艺对其性能的影响，以及对样品进行电击穿实验等。结果表明，高温烧结，液氮淬火，低温退火，缓慢降温有利于生成高温超导体相；超导样品是由一些颗粒连接而成，其击穿电压和零电阻温度成反比。     

超导电性理论特征

超导材料的种类非常广泛,有单质金属、合金材料、有机化合物、非金属单质、金属与非金属掺杂材料、金属氧化物等.从超导电性特征又分为非常规超导材料和常规超导材料.因此从超导电性的起源研究超导电性理论的特征具有重要的意义,既是重要的理论研究,又对合成、制备各种新型超导材料具有指导意义.分析研究了超导电性的本征特点,分别从超导的基本物理图像、同位素效应、超导转变温度计算公式表示等方面给出了常规超导体和非常规超导体的全面描述.同时理论上计算了一种有机复合超导材料.     

Superconductivity in MgB2

In January of 2001 the superconductivity of the compound MgB2 with a critical temperature Tc of up to 39 K was discovered. This Tc is the highest in all intermetallic compound and alloy superconductors. MgB2 has a simple structure and its manufacturing capital cost is lower, therefore it could become a practical superconductor in the future. The recent progress is reviewed here which covers the progress in electronic structure, high Tc mechanism, superconducting parameters (Debye temperature, specific heat coefficient of electron, critical fields, coherent length, penetration depth, energy gap, critical current and relaxation rate of flux). Moreover the issue on power transmission is discussed.     

超导磁悬浮列车模型设计

根据磁悬浮和超导工作原理,设计了一台低温超导体磁悬浮列车模型,在摄氏零下二百多度的液态氮环境中,列车不但可以在具有磁束缚的封闭磁轨道上悬浮或在磁轨道下方倒挂“悬浮”,还能够沿着一条60cm左右的直线轨道以悬浮状态无摩擦地运转。     

统计性超导电子对密度与温度无关

给出了统计性超导电子对密度和局域性超导电子对密度的定义;初步讨论了它们的物理意义。通过对nS（T）=λL2（0）/λL 2（T）=H C1（T）/H C1（0）的分析、GL超导波函数的计算及稳恒电流载流子总动量守恒定律的讨论,证明了零场下统计性超导电子对密度与温度无关。并初步给出了超导抗磁性、伦敦穿透深度不是超导体内禀性质的结论。     

Superconductivity in doped cubic silicon

Although the local resistivity of semiconducting silicon in its standard crystalline form can be changed by many orders of magnitude by doping with elements, superconductivity has so far never been achieved. Hybrid devices combining silicon's semiconducting properties and superconductivity have therefore remained largely underdeveloped. Here we report that superconductivity can be induced when boron is locally introduced into silicon at concentrations above its equilibrium solubility. For sufficiently high boron doping (typically 100 p.p.m.) silicon becomes metallic. We find that at a higher boron concentration of several per cent, achieved by gas immersion laser doping, silicon becomes superconducting. Electrical resistivity and magnetic susceptibility measurements show that boron-doped silicon (Si:B) made in this way is a superconductor below a transition temperature T(c) approximately 0.35 K, with a critical field of about 0.4 T. Ab initio calculations, corroborated by Raman measurements, strongly suggest that doping is substitutional. The calculated electron-phonon coupling strength is found to be consistent with a conventional phonon-mediated coupling mechanism. Our findings will facilitate the fabrication of new silicon-based superconducting nanostructures and mesoscopic devices with high-quality interfaces.     

高温超导滤波器应用的探索与实践

自1911年发现超导电性以来,在不断发现新材料,揭示新机理,发展新理论的同时,超导应用也取得了引人瞩目的进展,其中利用超导材料微波损耗很低的特性研制的微波滤波器和微波接收机前端子系统得到了世界各国的重视,并在实际应用中取得了重要成果.本研究组长期从事该领域的研究,并已取得一些成果.该文将从超导滤波器的创新设计方法入手,结合研究组近些年开展的工作,介绍高温超导滤波器及其子系统在无线通讯、气象雷达、射电天文以及空间技术等领域中的应用.