Chin. Phys. Lett.  2012, Vol. 29 Issue (6): 067402    DOI: 10.1088/0256-307X/29/6/067402
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
NMR Study of Superconductivity and Spin Fluctuations in Hole-Doped Superconductor Ca1-xNaxFe2As2 (Tc=32 K)
MA Long1, ZHANG Jin-Shan2, WANG Du-Ming1, HE Jun-Bao1, XIA Tian-Long1, CHEN Gen-Fu1, YU Wei-Qiang1**
1Department of Physics, Renmin University of China, Beijing 100872
2School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206
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MA Long, ZHANG Jin-Shan, WANG Du-Ming et al  2012 Chin. Phys. Lett. 29 067402
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Abstract We report both 23Na and 75As nuclear magnetic resonance (NMR) studies on hole?doped Ca1-xNaxFe2As2 superconducting single crystals (x≈0.67) with the superconducting temperature Tc=32 K. Singlet superconductivity is suggested by a sharp drop of the Knight shift 75K below Tc. The spin-lattice relaxation rate 1/T1 does not show the Slichter–Hebel coherence peak, which suggests an unconventional pairing. The penetration depth is estimated to be 0.24 μm at temperature T=2 K. Here 1/75T1T shows an anisotropic behavior and a prominent low-temperature upturn , with 75T1 denoting the 75As spin-lattice relaxation time and T the temperature, which indicates strong low-energy antiferromagnetic spin fluctuations and supports a magnetic origin of superconductivity.
Received: 18 November 2011      Published: 31 May 2012
PACS:  74.70.Xa (Pnictides and chalcogenides)  
  74.25.nj (Nuclear magnetic resonance)  
  76.60.-k (Nuclear magnetic resonance and relaxation)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/29/6/067402       OR      https://cpl.iphy.ac.cn/Y2012/V29/I6/067402
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MA Long
ZHANG Jin-Shan
WANG Du-Ming
HE Jun-Bao
XIA Tian-Long
CHEN Gen-Fu
YU Wei-Qiang
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