Homogeneous coexistence of superconducting and spin-density-wave states in CaFe1−xCoxAsF as seen via nuclear magnetic resonance
T. Nakano, S. Tsutsumi, N. Fujiwara, S. Matsuishi, H. Hosono
DOI 10.1103/PhysRevB.83.180508 · Physical Review B
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Abstract
We investigated the homogeneous coexistence of spin-density-wave (SDW) and superconducting (SC) states via As75-nuclear magnetic resonance (NMR) in CaFe1−xCoxAsF and found that the electronic and magnetic properties of this compound are intermediate between those of LaFeAsO1−xFx and Ba(Fe1−xCox)2As2. For 6% Co-doped samples, the paramagnetic spectral weight completely disappears in the crossover regime between the SDW and SC phases followed by anomalous behavior of relaxation rate (1/T1), implying that the two phases are not segregated. Co59-NMR spectra show that spin moments are not commensurate but spatially modulated. These experimental results suggest that incommensurate SDW (IC-SDW) and SC states are compatible in this compound.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | onset |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | midpoint |
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