Abstract
Resistivity and magnetic susceptibility measurements under external pressure were performed on NaFe1−xCoxAs (x = 0, 0.01, 0.028, 0.075 and 0.109) single crystals. For both underdoped and optimally doped NaFe1−xCoxAs, the maximum Tc reached as high as 31 K under certain pressures. Meanwhile the overdoped sample with x = 0.075 also exhibits a positive pressure effect on Tc, and an enhancement of Tc by 13 K is achieved under a pressure of 2.3 GPa. All of these superconducting samples show large positive pressure coefficients on superconductivity, being distinct from those of Ba(Fe1−xCox)2As2. However, the superconductivity cannot be induced by pressure in heavily overdoped non-superconducting NaFe0.891Co0.109As. These studies reveal that the electronic structure is very different between superconducting and heavily overdoped non-superconducting NaFe1−xCoxAs, consistent with the observation of angle-resolved photoemission spectroscopy.
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