We have measured the susceptibilities of the YBa_(2)Cu_(3)O_(x) single crystals,which were obtained by crushing the original ones to different sized.The susceptibility decreases rapidly as the size reduces.It indicate...We have measured the susceptibilities of the YBa_(2)Cu_(3)O_(x) single crystals,which were obtained by crushing the original ones to different sized.The susceptibility decreases rapidly as the size reduces.It indicates that the superconductivity exists only in the shell of a single crystal.展开更多
The superconducting transition temperature and grain size of dc sputtered Nb films are systematically investigated. The results show that the superconductivity is closely related to the grain size, rather than to the ...The superconducting transition temperature and grain size of dc sputtered Nb films are systematically investigated. The results show that the superconductivity is closely related to the grain size, rather than to the scattering strength of electrons or the surface layer proximity effect of the films.展开更多
The magnetic impurity scattering plays an important role in the phase coherence behavior of thin films.By using the thickness and disorder dependences of the low temperature logarithmic anomaly in resistivity we are a...The magnetic impurity scattering plays an important role in the phase coherence behavior of thin films.By using the thickness and disorder dependences of the low temperature logarithmic anomaly in resistivity we are able to determine the concentration of magnetic impurities in Au films and demonstrate that the low temperature saturation or plateau in phase decoherence time is closely related with the Kondo effect.展开更多
文摘We have measured the susceptibilities of the YBa_(2)Cu_(3)O_(x) single crystals,which were obtained by crushing the original ones to different sized.The susceptibility decreases rapidly as the size reduces.It indicates that the superconductivity exists only in the shell of a single crystal.
基金Supported by the National Basic Research Program of China (Grant No. 2006CB- 91304)the Knowledge Innovation Project of Chinese Academy of Sciences Contributed by ZHANG DianLin
文摘The superconducting transition temperature and grain size of dc sputtered Nb films are systematically investigated. The results show that the superconductivity is closely related to the grain size, rather than to the scattering strength of electrons or the surface layer proximity effect of the films.
基金supported by the National Basic Research Program of China (Grant No. 2006CB91304)the Knowledge Innovation Project of Chinese Academy of Sciences
文摘The magnetic impurity scattering plays an important role in the phase coherence behavior of thin films.By using the thickness and disorder dependences of the low temperature logarithmic anomaly in resistivity we are able to determine the concentration of magnetic impurities in Au films and demonstrate that the low temperature saturation or plateau in phase decoherence time is closely related with the Kondo effect.
