New 1201-type (Hg,Se)-superconducting cuprate grown by sol gel and sealed quartz tube synthesis

Details New 1201-type (Hg,Se)-superconducting cuprate grown by sol gel and sealed quartz tube synthesis New 1201-type (Hg,Se)-superconducting cuprate grown by sol gel and sealed quartz tube synthesis

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phyc..468.2322k&link_type=abstract

Physica C, Volume 468, Issue 23, p. 2322-2327.

Physics

61, 74, 75

Scientific paper

A new mercury based superconductor (Hg1-ySey)(Sr2-xLax)CuO4+δ (y = 0.25; 0.3 ⩽ x ⩽ 0.7) with a Tc(onset) of 50 K has been synthesized using sol gel process combined with the sealed quartz tube method. X-ray diffraction shows that the (Hg0.75Se0.25)(Sr2-xLax)CuO4+δ phase crystallizes in the tetragonal symmetry (space group P4/mmm) with a ≈ ap ≈ 3.8 Å and c ≈ 8.7 Å and is isostructural with the 94 K superconductor HgBa2CuO4+δ, adopting the so-called 1201-type structure. Both Se and La are necessary for the stabilization of the 1201-type Hg/Sr cuprates. EDX analysis indicated that mercury and selenium have incorporated into the structure with Se/Hg ≈ ⅓. The new high-Tc superconductor, (Hg0.75Se0.25)(Sr1.3La0.7)CuO4+δ, exhibits a current density, Jc, of 1270 KA/cm2 at (5 K and 5 T) which is higher than the estimated Jc value for (Hg,Cr)Sr2CuO4+δ.

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