Spin density wave and superconductivity in CaFe1−xCoxAsF studied by nuclear magnetic resonance
S. Tsutsumi, N. Fujiwara, S. Matsuishi, H. Hosono
DOI 10.1103/PhysRevB.86.060515 · Physical Review B
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Abstract
We performed nuclear magnetic resonance measurements to investigate the evolution of spin-density-wave (SDW) and superconducting (SC) states upon electron doping in CaFe1−xCoxAsF, which exhibits an intermediate phase diagram between those of LaFeAsO1−xFx and Ba(Fe1−xCox)2As2. We found that homogeneous coexistence of the incommensurate SDW and SC states occurs only in a narrow doping region around the crossover regime, which supports S+−-wave symmetry. However, only the structural phase transition survives upon further doping, which agrees with predictions from orbital fluctuation theory. The transitional features upon electron doping imply that both spin and orbital fluctuations are involved in the superconducting mechanism.
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. | 23 | Pressure not reported | unknown |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
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