Recently, several measurements of the nuclear spin-lattice relaxation rate T<sub>1</sub><sup>-1</sup> in the superconducting Fe pnictides have been reported. These measurements generally show no coherence peak below Tc and indicate a low-temperature power-law behavior, the characteristics commonly taken as evidence of unconventional superconductivity with lines of nodes crossing the Fermi surface. In this work we show that (i) the lack of a coherence peak is fully consistent with the previously proposed nodeless extended s±-wave symmetry of the order parameter (whether in the clean or dirty limit) and (ii) the low-temperature power-law behavior can be also explained in the framework of the same model but requires going beyond the Born limit.
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 2008|
Parker, D., Dolgov, O. V., Korshunov, M. M., Golubov, A. A., & Mazin, I. I. (2008). Extended s+ scenario for the neclear spin-lattice relaxation rate in superconducting pnictides. Physical review B: Condensed matter and materials physics, 78(13), 134524-. https://doi.org/10.1103/PhysRevB.78.134524