Using a very useful quantity in physics and chemistry,the electronegativity,we have found that for nearly 70 high-Tc oxide superconductors(HTOS),the average electronegativity is in a narrow range 2.5-2.7.The differenc...Using a very useful quantity in physics and chemistry,the electronegativity,we have found that for nearly 70 high-Tc oxide superconductors(HTOS),the average electronegativity is in a narrow range 2.5-2.7.The difference of bond character between the HTOS and the conventional superconductors has been discussed.Finally,two categories of superconductors in terms of the group average electronegativity are suggested.展开更多
A novel compound Fe-Ta-S crystal has been obtained using iodine vapor transport technology.At low temperature this compound is in a strong diamagnetic state,which is similar to a superconductor.The dependence of the d...A novel compound Fe-Ta-S crystal has been obtained using iodine vapor transport technology.At low temperature this compound is in a strong diamagnetic state,which is similar to a superconductor.The dependence of the diamagnetic phase transition temperature on the magnetic field could be expressed as T_(c)=Tc0+γH^(2/5)due to a strong coupling between electrons and the magnetic field.展开更多
文摘Using a very useful quantity in physics and chemistry,the electronegativity,we have found that for nearly 70 high-Tc oxide superconductors(HTOS),the average electronegativity is in a narrow range 2.5-2.7.The difference of bond character between the HTOS and the conventional superconductors has been discussed.Finally,two categories of superconductors in terms of the group average electronegativity are suggested.
基金Supported by the National Natural Science Foundation of Chinathe State Key Laboratory for Magnetism,Institute of Physics,Chinese Academy of Sciences.
文摘A novel compound Fe-Ta-S crystal has been obtained using iodine vapor transport technology.At low temperature this compound is in a strong diamagnetic state,which is similar to a superconductor.The dependence of the diamagnetic phase transition temperature on the magnetic field could be expressed as T_(c)=Tc0+γH^(2/5)due to a strong coupling between electrons and the magnetic field.
