^(75)As nuclear magnetic resonance(NMR)was measured for Ba(Fe_(1-x)Ni_(x))_(2)As_(2)single crystals with x=0.05 and x=0.1 under 0 and 1.5GPa,respectively.For the optimal doped sample with x=0.05,the superconducting tr...^(75)As nuclear magnetic resonance(NMR)was measured for Ba(Fe_(1-x)Ni_(x))_(2)As_(2)single crystals with x=0.05 and x=0.1 under 0 and 1.5GPa,respectively.For the optimal doped sample with x=0.05,the superconducting transition temperature,Tc,is strongly suppressed from 18 to 5 K,while for the over-doped sample with x=0.1,it is turned from a superconducting ground state to a disordered paramagnetic state under 1.5 GPa.Our experimental results show that the antiferromagnetic spin fluctuations,as well as Tc,are suppressed.The experimental results can be explained with the two-band model.As a result,the electronic band is shifted downwards with an increase in pressure,and the electrons become the dominant carriers in the system.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB921701the National Natural Science Foundation of China under Grant No 11015422the Knowledge Innovation Program of the Chinese Academy of Sciences under Grant No KJCX2-EW-W11.
文摘^(75)As nuclear magnetic resonance(NMR)was measured for Ba(Fe_(1-x)Ni_(x))_(2)As_(2)single crystals with x=0.05 and x=0.1 under 0 and 1.5GPa,respectively.For the optimal doped sample with x=0.05,the superconducting transition temperature,Tc,is strongly suppressed from 18 to 5 K,while for the over-doped sample with x=0.1,it is turned from a superconducting ground state to a disordered paramagnetic state under 1.5 GPa.Our experimental results show that the antiferromagnetic spin fluctuations,as well as Tc,are suppressed.The experimental results can be explained with the two-band model.As a result,the electronic band is shifted downwards with an increase in pressure,and the electrons become the dominant carriers in the system.
