Physics – Condensed Matter – Superconductivity
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phyc..247..197b&link_type=abstract
Physica C: Superconductivity, Volume 247, p. 197-205.
Physics
Condensed Matter
Superconductivity
Scientific paper
Five samples of the HgBa2Sm1-xCaxCu2O6+δ phase were prepared. They were synthesized with different compositions, by reacting metal oxides in closed silica ampoules at 720°C for 40 h. The phase is isostructural with the tetragonal 127 K superconductor HgBa2CaCu2O6+δ. The samples were investigated by electron microscopy, EDS analysis and X-ray powder diffraction. Electron diffraction revealed no superstructure or modulation. Rietveld structure refinements of two samples, with x = 0 and 0.5, indicated that the Hg sites were only partly occupied by mercury. A surplus of copper and samarium found in the analysis suggests that they partly substitute for mercury at this site. The refinements showed that the phase with x = 0.5 had less puckered Cu-O planes than HgBa2SmCu2O6+δ. The latter showed no superconducting transition down to 15 K, and its unit-cell dimensions were not changed by oxygen or nitrogen treatments at 300°C. The Ca containing phase, HgBa2Sm0.5Ca0.5Cu2O6+δ, had a broad superconducting transition with Tc onset = 115 K. The low superconducting volume indicates that the diamagnetic signal stems from more calcium-rich crystallites.
Antipov Evgeny V.
Bryntse Ingrid
Khasanova N. R.
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