| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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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| Cite this article: |
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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.
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Received: 18 November 2011
Published: 31 May 2012
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| PACS: |
74.70.Xa
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(Pnictides and chalcogenides)
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74.25.nj
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(Nuclear magnetic resonance)
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76.60.-k
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(Nuclear magnetic resonance and relaxation)
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