F19 NMR study of the coupling between 4f and itinerant electrons in the pnictide superconductors SmFeAsO1−xFx (0.15≤x≤0.2)
G. Prando, P. Carretta, A. Rigamonti, S. Sanna, A. Palenzona, M. Putti, M. Tropeano
DOI 10.1103/PhysRevB.81.100508 · Physical Review B
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Abstract
F19 NMR measurements in SmFeAsO1−xFx, for 0.15≤x≤0.2, are presented. The nuclear spin-lattice relaxation rate 1/T1 increases upon cooling with a trend analogous to the one already observed in CeCu5.2Au0.8, a quasi-two-dimensional heavy-fermion intermetallic compound with an antiferromagnetic ground state. In particular, the behavior of the relaxation rate either in SmFeAsO1−xFx or in CeCu5.2Au0.8 can be described in the framework of the self-consistent renormalization theory for weakly itinerant electron systems. Remarkably, no effect of the superconducting transition on F19 1/T1 is detected, a phenomenon which can hardly be explained within a single band model.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| SmFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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