Extended s± scenario for the nuclear spin-lattice relaxation rate in superconducting pnictides

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Parker, D. and Dolgov, O.V. and Korshunov, M.M. and Golubov, A.A. and Mazin, I.I. (2008) Extended s± scenario for the nuclear spin-lattice relaxation rate in superconducting pnictides. Physical Review B: Condensed matter and materials physics, 78 (13). p. 134524. ISSN 1098-0121

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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.
Item Type:Article
Copyright:© 2008 American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/59895
Official URL:http://dx.doi.org/10.1103/PhysRevB.78.134524
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Metis ID: 252552