Jul, 2009
Anisotropic spin fluctuations and multiple superconducting gaps in hole-doped Ba0.72K0.28Fe2As2: NMR in a single crystal
EPL
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- Volume
- 87
- Number
- 2
- First page
- 27012-1-27012-5
- Last page
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1209/0295-5075/87/27012
- Publisher
- IOP PUBLISHING LTD
We report the As-75-NMR study on a single crystal of the hole-doped iron-pnictide superconductor Ba0.72K0.28Fe2As2 (T-c = 31.5 K). 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/T-1 decreases below T-c with no coherence peak and shows a stepwise variation at low temperatures, which is indicative of multiple superconducting gaps, as in the electron-doped Pr(La) FeAsO1-xFx. Furthermore, no evidence was obtained for a microscopic coexistence of a long-range magnetic order and superconductivity. Copyright (C) EPLA, 2009
- Link information
- ID information
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- DOI : 10.1209/0295-5075/87/27012
- ISSN : 0295-5075
- eISSN : 1286-4854
- Web of Science ID : WOS:000269665400032