Volume 83, Number 5, September 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 July 2008|
Spin-singlet superconductivity with multiple gaps in PrFeAsO0.89F0.11
Department of Physics, Okayama University - Okayama 700-8530, Japan
2 Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
Corresponding author: email@example.com
Accepted: 15 July 2008
We report 75As and 19F NMR studies on the superconducting properties of the newly discovered compound PrFeAsO0.89F0.11 (Tc = 45 K). The Knight shift in the direction of -plane decreases below Tc to almost zero, which indicates spin-singlet pairing. The temperature dependencies of both the Knight shift and the spin lattice relaxation rate indicate that there are two gaps opening below Tc, with nodes in the gap function.
PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 74.70.Ad – Metals; alloys and binary compounds (including A15, MgB2, etc.)
© EPLA, 2008
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