Superconductivity at 31 K in 111 type iron arsenide superconductor NaxFeAs induced by pressure

cond-mat.supr-con

/ Authors

S. J. Zhang, X. C. Wang, Q. Q. Liu, Y. X. Lv, X. H. Yu, Z. J. Lin., Y. S. Zhao, L. Wang, Y. Ding, H. K. Mao

and 1 more author

/ Abstract

The effect of pressure on superconductivity of 111 type NaxFeAs is investigated through temperature dependent electrical resistance measurement in a diamond anvil cell. The superconducting transition temperature (Tc) increases from 26 K to a maximum 31 K as the pressure increases from ambient to 3 GPa. Further increasing pressure suppresses Tc drastically. The behavior of pressure tuned Tc in NaxFeAs is much different from that in LixFeAs, although they have the same Cu2Sb type structure