NMR and mSR in SmFeAsO1-xFx Superconductors

author: Pietro Carretta, Facoltà di Scienze MMFFNN, University of Pavia
published: Oct. 16, 2009,   recorded: September 2009,   views: 3362

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Among the recently discovered pnictide superconductors the highest superconducting critical temperature has been measured for SmFeAsO1-xFx family (TC < 55 K). A brief overview on recent results obtained by means of 19F nuclear magnetic resonance and muon spin rotation in SmFeAsO1-xFx superconductors will be presented. 19F nuclear spin-lattice relaxation, which allows to probe the low-energy excitations within the Sm layers, shows a behavior which is rather characteristic of heavy-fermion compounds with a magnetic ground-state. From the temperature dependence of the NMR linewidth information on the static properties of the flux lines lattice and on the superconducting order parameter can be derived. These results are compared with the ones obtained by muon spin rotation, which represents a powerful tool to study the doping and temperature dependence of the London penetration depth and to evidence the possible coexistence of superconductivity and magnetism at the microscopic level. A comparison between the phenomenology observed in cuprates and Fe-based superconductors will be made throughout the seminar.

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