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http://dx.doi.org/10.9714/psac.2018.20.3.001

Synthesis of new Pb-based layered cuprates in (Pb,S)(Sr,La)CuOz compounds  

Kim, Jin (Kangwon National University)
Lee, Ho Keun (Kangwon National University)
Publication Information
Progress in Superconductivity and Cryogenics / v.20, no.3, 2018 , pp. 1-4 More about this Journal
Abstract
The effect of sulfate substitution on the formation of (Pb,S)-1201 type phase was investigated. Polycrystalline samples with nominal compositions of $(Pb_{0.5}B_{0.5-x}S_x)(Sr_{2-y}La_y)CuO_z$, (x = 0 - 0.5, y = 0.7 - 1.0) and $(Pb_{0.5}S_{0.5})(Sr_{2-y}La_y)CuO_z$ (y = 0.5 - 1.0) were prepared by using a solid-state reaction method. The samples were characterized by powder X-ray diffraction (XRD) and resistivity measurements. XRD data revealed that almost-single (Pb,S)-1201 phase samples could be obtained for x = 0.5 and y = 0.9-1.0, judging from the similar results of the XRD patterns between the (Pb,S)-1201 and (Pb,B)-1201 phases. Each of the samples has a crystal structure with tetragonal symmetry. The sample with x = 0.5 and y = 0.9 is found to show an onset of resistivity dropping at over 23 K and zero resistivity at 12 K.
Keywords
Pb-based 1201 cuprate; superconductivity; sulfate doping; $(Pb_{0.5}S_{0.5})(Sr_{2-y}La_y)CuO_z$;
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