The ac magnetic susceptibility,the magnetoresistance R(H)and the dependence of the resistivity on temperature under different applied field were investigated in the Pb-doped Bi-Ca-Sr-Cu-O system.A superconducting phas...The ac magnetic susceptibility,the magnetoresistance R(H)and the dependence of the resistivity on temperature under different applied field were investigated in the Pb-doped Bi-Ca-Sr-Cu-O system.A superconducting phase with Tc-100K exists tn this sintered sample.It forms a well connecting network,and therefore the Josephson coupling between the superconducting grains is sharply improved by doping lead.展开更多
Results of resistivity,ac magnetic susceptibility,and Halleffect measurements for Ba_(1.2)Y_(0.9)V_(0.9)Cu_(3)0_(7-δ)are reported.The positive value of Hall constant indicates that the material conducts via holes wit...Results of resistivity,ac magnetic susceptibility,and Halleffect measurements for Ba_(1.2)Y_(0.9)V_(0.9)Cu_(3)0_(7-δ)are reported.The positive value of Hall constant indicates that the material conducts via holes with a carrier concentration of 1.6×10^(21)cm^(-3)at room temperature.A large anomaly in RH near Tc is observed.展开更多
Superconducting transition has been observed by electrical resistance and a.c.magnetic susceptibility measurements in Tm_(x)Ba_(1-x)CuO_(3-y) with x=0.6 and 0.7 and y>0.The highest T_(c) of the samples measured is ...Superconducting transition has been observed by electrical resistance and a.c.magnetic susceptibility measurements in Tm_(x)Ba_(1-x)CuO_(3-y) with x=0.6 and 0.7 and y>0.The highest T_(c) of the samples measured is observed in Tm_(0.6)-Ba_(0.4)CuO_(3-y) which has the T_(c)(mid)=91K with ΔT_(c)=0.5K,and T_(c)(ρ=0)=90.1K.The a.c.magnetic susceptibility measurements show a very strong diamagnetism at the temperature of resistive midpoint.展开更多
文摘The ac magnetic susceptibility,the magnetoresistance R(H)and the dependence of the resistivity on temperature under different applied field were investigated in the Pb-doped Bi-Ca-Sr-Cu-O system.A superconducting phase with Tc-100K exists tn this sintered sample.It forms a well connecting network,and therefore the Josephson coupling between the superconducting grains is sharply improved by doping lead.
文摘Results of resistivity,ac magnetic susceptibility,and Halleffect measurements for Ba_(1.2)Y_(0.9)V_(0.9)Cu_(3)0_(7-δ)are reported.The positive value of Hall constant indicates that the material conducts via holes with a carrier concentration of 1.6×10^(21)cm^(-3)at room temperature.A large anomaly in RH near Tc is observed.
文摘Superconducting transition has been observed by electrical resistance and a.c.magnetic susceptibility measurements in Tm_(x)Ba_(1-x)CuO_(3-y) with x=0.6 and 0.7 and y>0.The highest T_(c) of the samples measured is observed in Tm_(0.6)-Ba_(0.4)CuO_(3-y) which has the T_(c)(mid)=91K with ΔT_(c)=0.5K,and T_(c)(ρ=0)=90.1K.The a.c.magnetic susceptibility measurements show a very strong diamagnetism at the temperature of resistive midpoint.
