Extended s+ scenario for the neclear spin-lattice relaxation rate in superconducting pnictides

D. Parker, O.V. Dolgov, M.M. Korshunov, Alexandre Avraamovitch Golubov, I.I. Mazin

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Abstract

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.
Original languageUndefined
Pages (from-to)134524-
JournalPhysical review B: Condensed matter and materials physics
Volume78
Issue number13
DOIs
Publication statusPublished - 2008

Keywords

  • METIS-252552
  • IR-59895

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