Synthesis and characterization of single crystals of the superconductors Hg0.8Bi0.2Ba2Can-1CunO2n+2+δ (n=2,3)

Details Synthesis and characterization of single crystals of the superconductors Hg0.8Bi0.2Ba2Can-1CunO2n+2+δ (n=2,3) Synthesis and characterization of single crystals of the superconductors Hg0.8Bi0.2Ba2Can-1CunO2n+2+δ (n=2,3)

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvb..5416246p&link_type=abstract

Physical Review B (Condensed Matter), Volume 54, Issue 22, December 1, 1996, pp.16246-16253

Physics

Condensed Matter

17

Bi-Based Cuprates, Magnetic Properties, X-Ray Diffraction

Scientific paper

Single crystals of the 1212 (n=2) and 1223 (n=3) mercury based cuprates have been grown using Bi2O3 as a flux during the growth. The bismuth cations act as stabilizers of the structures which do not require the use of a dry box or high pressure. Electron microscopy and coupled energy dispersive spectroscopy analyses evidence the regularity of the 1212 and 1223 structures with a mercury layer of composition close to Hg0.8Bi0.2. Moreover the structural refinements based on x-ray-diffraction data of these crystals, show at the level of the [(Hg,Bi)Oδ] layer a splitting of the oxygen site around the position (1/21/20). These as-grown superconducting crystals exhibit critical temperatures of 121 and 130 K for 1212 and 1223, respectively. The irreversibility lines (IL) and fishtail lines (FL) of these crystals are compared to those of (Hg,Bi)-1201 crystals and grain aligned Hg-1223 ceramics. These data show that the Hg0.8Bi0.2-1223 IL and FL lie above that of Hg0.8Bi0.2-1212. This suggests that the anisotropy of 1223 is smaller than that of 1212. The similarity of the FL's location of isostructural Tl-1223 and Hg0.8Bi0.2-1223 illustrates the role of the structure on the superconducting properties.

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