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

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