With iodine vapour treatment of various single crystals of Bi-Sr-Ca-Ln(Rare earth element)-Cu-O system,the stage-1 iodine intercalation compounds of Bi_(2)(Sr,Nd)_(2)CuO_(y) (2201),Bi_(2)Sr_(2)(Ca,Gd)Cu_(2)O_(y) or Bi...With iodine vapour treatment of various single crystals of Bi-Sr-Ca-Ln(Rare earth element)-Cu-O system,the stage-1 iodine intercalation compounds of Bi_(2)(Sr,Nd)_(2)CuO_(y) (2201),Bi_(2)Sr_(2)(Ca,Gd)Cu_(2)O_(y) or Bi_(2)Sr_(2)CaCu_(2)O_(y)(2212)and Big SrCaO14 have been prepared.x-ray difraction and transmission electron microscope analysis indicate that iodine layer of thickness 3.2-3.5A is formed between two Bi_(2)-O_(2) layers.展开更多
A new series of layered cuprate compounds MSr_(2)Nd_(2-x)Ce_(x)Cu_(2)O_(10-δ)(M=Ta,Nb)have been synthesized.The structure of the compounds is similar to that of Tl-1222.A peak in the R-T curve for the sample of TaSr_...A new series of layered cuprate compounds MSr_(2)Nd_(2-x)Ce_(x)Cu_(2)O_(10-δ)(M=Ta,Nb)have been synthesized.The structure of the compounds is similar to that of Tl-1222.A peak in the R-T curve for the sample of TaSr_(2)Nd_(1.3)Ce_(0.7)Cu_(2)O_(10-δ) has been observed at about 50K.For the sample of NbSr_(2)Nd_(1.45)Ce_(0.55)Cu_(2)O_(10-δ),metal-like conductivity behaviour has been observed.We have found superconductivity at about 13.2K in the samples of NbSr_(2)Nd_(2-x)Ce_(x)Cu_(2)O_(10-δ)(x=0.49,0.50,0.51,0.52).展开更多
基金Supported by the National Center for Research and Development on Superconductivity。
文摘With iodine vapour treatment of various single crystals of Bi-Sr-Ca-Ln(Rare earth element)-Cu-O system,the stage-1 iodine intercalation compounds of Bi_(2)(Sr,Nd)_(2)CuO_(y) (2201),Bi_(2)Sr_(2)(Ca,Gd)Cu_(2)O_(y) or Bi_(2)Sr_(2)CaCu_(2)O_(y)(2212)and Big SrCaO14 have been prepared.x-ray difraction and transmission electron microscope analysis indicate that iodine layer of thickness 3.2-3.5A is formed between two Bi_(2)-O_(2) layers.
文摘A new series of layered cuprate compounds MSr_(2)Nd_(2-x)Ce_(x)Cu_(2)O_(10-δ)(M=Ta,Nb)have been synthesized.The structure of the compounds is similar to that of Tl-1222.A peak in the R-T curve for the sample of TaSr_(2)Nd_(1.3)Ce_(0.7)Cu_(2)O_(10-δ) has been observed at about 50K.For the sample of NbSr_(2)Nd_(1.45)Ce_(0.55)Cu_(2)O_(10-δ),metal-like conductivity behaviour has been observed.We have found superconductivity at about 13.2K in the samples of NbSr_(2)Nd_(2-x)Ce_(x)Cu_(2)O_(10-δ)(x=0.49,0.50,0.51,0.52).
