Local spin fluctuations in iron-based superconductors: Se77 and Rb87 NMR measurements on Tl0.47Rb0.34Fe1.63Se2
Long Ma, G. F. Ji, Jia Dai, J. B. He, D. M. Wang, G. F. Chen, Bruce Normand, Weiqiang Yu
DOI 10.1103/PhysRevB.84.220505 · Physical Review B
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Abstract
We report nuclear magnetic resonance (NMR) studies of the intercalated iron selenide superconductor (Tl,Rb)yFe2−xSe2 (Tc=32 K). Single-crystal measurements up to 480 K on both 77Se and 87Rb nuclei show a superconducting phase with no magnetic order. The Knight shifts K and relaxation rates 1/T1T increase very strongly with temperature above Tc, before flattening at 400 K. The quadratic T-dependence and perfect proportionality of both K and 1/T1T data demonstrate their origin in paramagnetic moments. A minimal model for this pseudogap-type response is not a missing density of states, but rather two additive contributions from the itinerant electronic and local magnetic components, a framework unifying the K and 1/T1T data in many iron-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl0.47Rb0.34Fe1.63Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
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