NMR Investigation of the Quasi-One-Dimensional Superconductor K2Cr3As3
H. Z. Zhi, T. Imai, F. L. Ning, Jin-Ke Bao, Guang-Han Cao
DOI 10.1103/PhysRevLett.114.147004 · Physical Review Letters
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Abstract
We report As75 NMR measurements on the new quasi-one-dimensional superconductor K2Cr3As3 (Tc∼6.1 K) [J. K. Bao et al., Phys. Rev. X 5, 011013 (2015)]. We found evidence for strong enhancement of Cr spin fluctuations above Tc in the [Cr3As3]∞ double-walled subnanotubes based on the nuclear spin-lattice relaxation rate 1/T1. The power-law temperature dependence, 1/T1T∼T−γ (γ∼0.25), is consistent with the Tomonaga-Luttinger liquid. Moreover, absence of the Hebel-Slichter coherence peak of 1/T1 just below Tc suggests an unconventional nature of superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.1 | Pressure unresolved | onset |
| Rb2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | unknown |
| Cs2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | unknown |
| CrAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | 0.7 GPa | unknown |
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