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- Title
Multiple Superconducting Gaps and Anisotropic Spin Fluctuations in Hole-Doped and Electron-Doped Iron-Pnictides: NMR Studies.
- Authors
Zheng, Guo-qing K.; Matano, K.; Kawasaki, S.; Li, Z.; Sun, G. L.; Sun, D. L.; Lin, C. T.; Chen, G. F.; Luo, J. L.; Wang, N. L.; Ren, Z. A.; Zhao, Z. X.
- Abstract
We present extensive 75As-NMR data on the electron-doped pnictides PrFeAsO0.89F0.11 ( Tc=45 K), LaFeAsO0.92F0.08 ( Tc=23 K), and the hole-doped Ba0.72K0.28Fe2As2 ( Tc=31.5 K) single crystal. We find that the Fe antiferromagnetic spin fluctuations are anisotropic and are weaker compared to underdoped copper-oxides or cobalt-oxide superconductors. The spin lattice relaxation rate 1/ T1 decreases below Tc with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below Tc and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps.
- Subjects
SUPERCONDUCTIVITY; ELECTRIC conductivity; SOLID state electronics; NUCLEAR magnetic resonance spectroscopy; PARTICLES (Nuclear physics)
- Publication
Journal of Superconductivity & Novel Magnetism, 2010, Vol 23, Issue 5, p609
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-010-0749-1