Chin. Phys. Lett.  2012, Vol. 29 Issue (1): 017401    DOI: 10.1088/0256-307X/29/1/017401
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
75As Nuclear Magnetic Resonance Studies on Ba(Fe1−xNix)2As2 Single Crystals under High Pressure
ZHANG Xiao-Dong1, FAN Guo-Zhi1, ZHANG Cheng-Lin2, JING Xiu-Nian1, LUO Jian-Lin1**
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
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ZHANG Xiao-Dong, FAN Guo-Zhi, ZHANG Cheng-Lin et al  2012 Chin. Phys. Lett. 29 017401
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Abstract 75As nuclear magnetic resonance (NMR) was measured for Ba(Fe1−xNix)2As2 single crystals with x=0.05 and x=0.1 under 0 and 1.5 GPa, 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.
Keywords: 74.25.nj 74.25.Ha     
Received: 10 October 2011      Published: 07 February 2012
PACS:  74.25.nj 74.25.Ha  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/29/1/017401       OR      https://cpl.iphy.ac.cn/Y2012/V29/I1/017401
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ZHANG Xiao-Dong
FAN Guo-Zhi
ZHANG Cheng-Lin
JING Xiu-Nian
LUO Jian-Lin
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