Ferromagnetic Spin Fluctuation and Unconventional Superconductivity in Rb${}_2$Cr${}_3$As${}_3$ revealed by ${}^{75}$As NMR and NQR

Abstract

We report ${}^{75}$As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies on the superconductor Rb${}_2$Cr${}_3$As${}_3$ with a quasi one-dimensional crystal structure. Below $T\sim$ 100 K, the spin-lattice relaxation rate (1/$T_1$) divided by temperature, 1/$T_{1}T$, increases upon cooling down to $T_{\mathrm{c}}$ = 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/$T_1$ decreases rapidly below $T_{\text{c}}$ without a Hebel-Slichter peak, and follows a $T^5$ variation below $T\sim$ 3 K, which point to unconventional superconductivity with point nodes in the gap function.

submitted for publication on June 22, 2015

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