Electrical and magnetic properties of the metallic Nd"1"."8"5Ce"0"."1"5CuO"4"-"y superconductor - Chen, J.W.; Chou, W.-C. (Elsevier)
Samples of Nd"2"-"xCe"xCuO"4"-"x with x=0.13, 0.15 and 0.17 have been prepared under N"2 and He atmospheres at various temperatures. AC electrical resistance R(T) measurements reveals a metallic behavior in the normal state resistance for the Nd"1"."8"5Ce"0"."1"5CuO"4"-"y sample which was annealed in the He atmosphere at 1000^oC. A superconducting transition occurs at 24 K with the mid-point transition temperature T"c(50%)=19 K and a superconducting transition width T"c (T"c(90%)-T"c(10%))=9 K. DC magnetization measurement reveals bulk superconductivity in the sample. Powder X-ray diffraction patterns indicate a single-phase Nd"2CuO"4"-"y structure in this simple. The lattice parameters deduced from the diffraction peaks yield the values of a=3.950+/-0.002 Å and c=12.067+/-0.009 Å, respectively.
http://linkinghub.elsevier.com/retrieve/pii/0921-4534(90)90609-I
Keywords: U