Physics – Condensed Matter – Superconductivity
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phyc..268..257b&link_type=abstract
Physica C: Superconductivity, Volume 268, Issue 3-4, p. 257-265.
Physics
Condensed Matter
Superconductivity
23
Elsevier: Synthesis, Single-Crystal Growth, Structure, Magnetic Susceptibility
Scientific paper
Single crystals of HgBa2CuO4+δ of submillimetric sizes were grown with the same one step, low pressure, gold amalgamation technique used to obtain single crystals of HgBa2Ca2Cu3O8+δ. Remarkable superconducting properties are displayed by the samples which are optimally doped as grown. The sharpness of the transition profiles of the magnetic susceptibility, its anisotropy dependence and the volume fraction exhibiting the Meissner effect exceed the values obtained with the best crystal samples of Hg-1223. X-rays show that no substitutional defects have been found in the mercury plane, in particular no mixed occupancy of copper at the mercury site. The interstitial oxygen content at (1/2, 1/2, 0) δ = 0.066+/-0.008 is about one third that observed in optimally doped Hg-1223, resulting in an identical doping level per CuO2 plane in both compounds.
Bertinotti A.
Colson Dorothee
Forget Anne
Hammann Jacques
Le Bras Georges
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