NMR study of the new magnetic superconductor CaK(Fe0.951Ni0.049)4As4: Microscopic coexistence of the hedgehog spin-vortex crystal and superconductivity
Q.-P. Ding, W. R. Meier, A. E. Böhmer, S. L. Bud'ko, P. C. Canfield, Y. Furukawa
DOI 10.1103/PhysRevB.96.220510 · Physical Review B
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Abstract
The coexistence of a new-type antiferromagnetic (AFM) state, the so-called hedgehog spin-vortex crystal (SVC), and superconductivity (SC) is evidenced by an As75 nuclear magnetic resonance study on single-crystalline CaK(Fe0.951Ni0.049)4As4. The hedgehog SVC order is clearly demonstrated by the direct observation of internal magnetic induction along the c axis at the As1 site (close to K) and a zero net internal magnetic induction at the As2 site (close to Ca) below an AFM ordering temperature TN∼52 K. The nuclear spin-lattice relaxation rate 1/T1 shows a distinct decrease below Tc∼10 K, providing also unambiguous evidence for the microscopic coexistence. Furthermore, based on the analysis of the 1/T1 data, the hedgehog SVC-type spin correlations are found to be enhanced below T∼150 K in the paramagnetic state. These results indicate the hedgehog SVC-type spin correlations play an important role for the appearance of SC in the new magnetic superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaK(Fe0.951Ni0.049)4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.5 | Pressure unresolved | unknown |
| CaK(Fe0.951Ni0.049)4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure unresolved | onset |
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