High-pressure synthesis and superconductivity of Ca2-xNaxCuO2Cl2

Details High-pressure synthesis and superconductivity of Ca2-xNaxCuO2Cl2 High-pressure synthesis and superconductivity of Ca2-xNaxCuO2Cl2

2006-06-22

arxiv.org/abs/cond-mat/0606568v1

Physica C 460-462 (2007) 372

Physics

Condensed Matter

Superconductivity

2 pages, 4 figures, submitted to Physica C (M2S-HTSC 2006 Proceedings)

Scientific paper

10.1016/j.physc.2007.03.292

Ca2-xNaxCuO2Cl2 is a structural analogue to the La2-xSrxCuO4 superconductor. By substituting Na+ for Ca2+ mobile holes are introduced into the CuO2 planes. A series of experiments shows that the Na content x depends not only on the pressure during synthesis but also on the synthesis temperature and time. Ca2-xNaxCuO2Cl2 crystals (x=0.10 and Tc,on=13.5 K) up to 1x1x0.05 mm3 have been grown by a flux method at 35 kbar and the temperature was slowly ramped from 1250 C to 1050 C within 8 h. Applying higher synthesis pressure (up to 55 kbar) and temperature (up to 1700 C) results in polycrystalline samples with highest Tc,on=28.0 K at x=0.20. Further experiments are under way to optimize conditions to grow crystals with extended concentration of Na and Tc characteristic for optomally doped and overdoped regions.

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