A new series of 1222-type thallium-indium layered cuprate compounds(Tl,In)Sr_(2)(Nd,Ce)_(2)Cu_(2)O_(z)have been successfully synthesized in the pure or nearly pure form and identified by powder x-ray diffraction analy...A new series of 1222-type thallium-indium layered cuprate compounds(Tl,In)Sr_(2)(Nd,Ce)_(2)Cu_(2)O_(z)have been successfully synthesized in the pure or nearly pure form and identified by powder x-ray diffraction analyses.The structure of the compounds is directly related to that of Nb-1222 NbSr_(2)(Nd,Ce)_(2)Cu_(2)O_(z),with a tetragonal body-center lattice.The lattice parameters are a=3.85Å,c=29.56Åfor(Tl_(0.7)ln_(0.3))Srz(Nd_(0.5)Ce_(0.5))_(2)Cu_(2)O_(z),and a=3.85Å,c=29.28Åfor lnSr_(2)(Nd_(0.75)Ce_(0.25))_(2)Cu_(2)O_(z).Resistance measurements showed that(T1_(1-x)In_(x))Sr_(2)(Nd_(0.75)Ce_(0.25))_(2)Cu_(2)O_(z)(x≤0.8)are superconducting with Tc(onset)=30-40K.展开更多
基金Supported by a grant of the Arkansas Energy Office.
文摘A new series of 1222-type thallium-indium layered cuprate compounds(Tl,In)Sr_(2)(Nd,Ce)_(2)Cu_(2)O_(z)have been successfully synthesized in the pure or nearly pure form and identified by powder x-ray diffraction analyses.The structure of the compounds is directly related to that of Nb-1222 NbSr_(2)(Nd,Ce)_(2)Cu_(2)O_(z),with a tetragonal body-center lattice.The lattice parameters are a=3.85Å,c=29.56Åfor(Tl_(0.7)ln_(0.3))Srz(Nd_(0.5)Ce_(0.5))_(2)Cu_(2)O_(z),and a=3.85Å,c=29.28Åfor lnSr_(2)(Nd_(0.75)Ce_(0.25))_(2)Cu_(2)O_(z).Resistance measurements showed that(T1_(1-x)In_(x))Sr_(2)(Nd_(0.75)Ce_(0.25))_(2)Cu_(2)O_(z)(x≤0.8)are superconducting with Tc(onset)=30-40K.
