压力驱动“111”型NaFeAs的超导温度最高达31K
 （Superconductivity at 31K in the “111”-type iron arsenide superconductor Na1-xFeAs induced by pressure)

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 C. Q. Jin

Europhysics Letters 88, 47008 (2009)

 　　

　　2008年6月我们发现了“111”型铁基超导材料。近期我们观察到了压力驱动下NaFeAs超导转变温度可以达到31K，这是在“111”型铁基超导体中最高的超导转变温度。

      

　　The effect of pressure on the superconductivity of "111" -type Na1-xFeAs is investigated through temperature-dependent electrical-resistance measurements in a diamond anvil cell. The superconducting transition temperature (Tc) increases from 26K to a maximum of 31K as the pressure increases from ambient pressure to 3GPa. Further increasing pressure suppresses T c drastically. The behavior of pressure-tuned T c in Na1-xFeAs is much different from that in LixFeAs, although they have the same Cu2Sb-type structure.