Ferromagnetic Spin Fluctuation and Unconventional Superconductivity in Rb2Cr3As3 Revealed by As75 NMR and NQR
J. Yang, Z. T. Tang, G. H. Cao, Guo-qing Zheng
DOI 10.1103/PhysRevLett.115.147002 · Physical Review Letters
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Abstract
We report As75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies on the superconductor Rb2Cr3As3 with a quasi-one-dimensional crystal structure. Below T∼100 K, the spin-lattice relaxation rate (1/T1) divided by temperature, 1/T1T, increases upon cooling down to Tc=4.8 K, showing a Curie-Weiss-like temperature dependence. The Knight shift also increases with decreasing temperature. These results suggest ferromagnetic spin fluctuation. In the superconducting state, 1/T1 decreases rapidly below Tc without a Hebel-Slichter peak, and follows a T5 variation below T∼3 K, which points to unconventional superconductivity with point nodes in the gap function.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure unresolved | onset |
| CrAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
| K2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.1 | Pressure unresolved | unknown |
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