Incommensurate spin-density wave and a multiband superconducting phase in NaxFeAs revealed by nuclear magnetic resonance
M. Klanjšek, P. Jeglič, B. Lv, A. M. Guloy, C. W. Chu, D. Arčon
DOI 10.1103/PhysRevB.84.054528 · Physical Review B
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Abstract
We report a 23Na and 75As nuclear magnetic resonance (NMR) investigation of NaxFeAs series (x=1, 0.9, 0.8) exhibiting a spin-density-wave (SDW) order below TSDW=45, 50, and 43 K for x=1, 0.9, 0.8, respectively, and a bulk superconductivity below Tc≈12 K for x=0.9. Below TSDW, a spin-lattice relaxation reveals the presence of gapless particle-hole excitations in the whole x range, meaning that a portion of the Fermi surface remains gapless. The superconducting fraction as deduced from the bulk susceptibility scales with this portion, while the SDW order parameter as deduced from the NMR linewidth scales inversely with it. The NMR line shape can only be reproduced assuming an incommensurate (IC) SDW. These findings qualitatively correspond to the mean-field models of competing interband magnetism and intraband superconductivity, which lead to an IC SDW order coexisting with superconductivity in part of the phase diagram.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.9FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| Na0.9FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
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