Superconductivity at 33 K in "111" single crystals at ambient pressure

Details Superconductivity at 33 K in "111" single crystals at ambient pressure Superconductivity at 33 K in "111" single crystals at ambient pressure

2010-01-19

arxiv.org/abs/1001.3311v2

Physics

Condensed Matter

Superconductivity

9 pages, 2 figures with figures redrawn, references updated, and some typo corrected

Scientific paper

We have successfully grown single crystalline NaFeAs with cobalt or phosphor doping. Bulk superconductivity occurs in NaFe$_{0.95}$Co$_{0.05}$As at 19 K while much higher transition temperature is observed in NaFeAs$_{0.8}$P$_{0.2}$, in which the Tc of 33 K is even higher than the highest value realized by applying pressure in NaFeAs and all other isoelectronic element substituted samples. We discuss these behaviours by comparison with 122 and 1111 systems. We hope that our findings will help improve our understanding of iron-based superconductivity.

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