New pb-based 1222 cuprates, (Pb0.5B0.5)Sr-2(RE2-x-yCexSry )Cu2Oz (RE=Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Y)

作者：Sasakura Hiroyuki^*; Akagi Yoshiya; Tsukui Shigeki; Adachi Motoaki

来源：Journal of Superconductivity and Novel Magnetism, 2008, 21(4): 249-252.

DOI：10.1007/s10948-008-0325-0

• new Pb-based cuprate
• 1222 phase
• (Pb0.5B0.5)Sr-2(RE2-x-yCexSry )Cu2Oz
• electrical resistivity
• X-ray diffraction

New Pb-based layered cuprates with the 1222 structure have been synthesized in the (Pb0.5B0.5)Sr-2 (RE2-x-y Ce (x) Sr (y) )Cu2O (z) (RE=Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Y) systems. The almost-single-phase samples in the systems can be obtained for a nominal composition of x=0.7 and y=0.1. The crystal structure of the samples has a tetragonal symmetry, the lattice parameters of a and c are increasing with increasing the ionic radius of RE element. Despite treatment under high O-2 pressure of 100 atm, the samples are semiconductors with the transport process characteristic of three-dimensional variable range hopping conduction.

• 出版日期2008-5