A new (Hg,V)-based 1212-type cuprate (Hg,V) Sr2(Y,Ca) Cu2Oz with Tc(onset) up to 110 K |
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Authors: | O Chmaissem Z Z Sheng |
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Institution: | 1. Department of Physics, University of Arkansas, 72701, Fayetteville, AR, USA
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Abstract: | We have successfully synthesized a new (Hg, V)-based 1212-type cuprate (Hg1?x V x )Sr2(Y1?y Ca y )Cu2O z . 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, andT c(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) Å andc=11.8514(6) Å. 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. |
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