A new (Hg, V)-based 1212-type cuprate (Hg, V) Sr2(Y, Ca) Cu2Oz with Tc(onset) up to 110 K

Autor: O. Chmaissem, Z.Z. Sheng
Rok vydání: 1995
Předmět:
Zdroj: Zeitschrift für Physik B Condensed Matter. 99:179-184
ISSN: 1431-584X
0722-3277
Popis: We have successfully synthesized a new (Hg, V)-based 1212-type cuprate (Hg1−xVx)Sr2(Y1−yCay)Cu2Oz. The electrical resistance measurements showed that some of the as-synthesized materials with proper Hg/V and Y/Ca ratios exhibit weak superconductivity. Oxygen-annealing significantly improved their superconducting behavior, andTc(onset) up to 110 K was observed. The lattice parameters of (Hg,V)-1212 were found to be in the order ofa=3.8415(1) A andc=11.8514(6) A. Substitu ting mercury atoms by vanadium ones results in an important increase of thea parameter and an important decrease of thec parameter compared to the known Hg-based Sr-bearing compounds. The crystal structure of (Hg, V)-1212 was refined by Rietveld refinement against X-ray powder data using the tetragonal symmetry of space groupP4/mmm. The V and Cu valence states and superconductivity in this new (Hg, V)-1212 cuprate are briefly discussed.
Databáze: OpenAIRE
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