KV3000是江民科技杀毒软件的升级产品,此次升级,KV3000在软件功能及杀毒特性上有了较大程度的改进。和江民科技以往的杀毒软件来比,K V 3000系列杀毒软件全面支持DOS、Windows95/98/ME/NT/2000系统,为日益增多的NT服务器查杀病毒提供了...KV3000是江民科技杀毒软件的升级产品,此次升级,KV3000在软件功能及杀毒特性上有了较大程度的改进。和江民科技以往的杀毒软件来比,K V 3000系列杀毒软件全面支持DOS、Windows95/98/ME/NT/2000系统,为日益增多的NT服务器查杀病毒提供了强有力的支持.展开更多
The self-compensating compound of Y1-χ CaχBa2-χLaχ Cu3Oy is synthesized through a solid-state reaction method with χ from 0.25 to 0.55. Structural and superconducting properties have been investigated by χ-ray d...The self-compensating compound of Y1-χ CaχBa2-χLaχ Cu3Oy is synthesized through a solid-state reaction method with χ from 0.25 to 0.55. Structural and superconducting properties have been investigated by χ-ray diffraction, Rietveld refinement, and dc magnetization measurement, respectively. The impure peaks appear when χ is more than 0.5 in the diffraction pattern. Orthorhombic-tetragonal transition occurs at χ = 0.45. Some local structural parameters, such as Cu（1）-O（4）, Cu（2）-O（4） bond lengths, change randomly in a narrow range. The relationship between the character of （Ba/La）-O plane and Tc is rather interesting. We attribute the behaviour of superconductivity to the joint effects of these local structural parameters. The results give the evidence that the influence of the structural change on superconductivity is essential and independent of carrier concentration.展开更多
文摘The self-compensating compound of Y1-χ CaχBa2-χLaχ Cu3Oy is synthesized through a solid-state reaction method with χ from 0.25 to 0.55. Structural and superconducting properties have been investigated by χ-ray diffraction, Rietveld refinement, and dc magnetization measurement, respectively. The impure peaks appear when χ is more than 0.5 in the diffraction pattern. Orthorhombic-tetragonal transition occurs at χ = 0.45. Some local structural parameters, such as Cu（1）-O（4）, Cu（2）-O（4） bond lengths, change randomly in a narrow range. The relationship between the character of （Ba/La）-O plane and Tc is rather interesting. We attribute the behaviour of superconductivity to the joint effects of these local structural parameters. The results give the evidence that the influence of the structural change on superconductivity is essential and independent of carrier concentration.
