NMR Investigation of the Quasi One-dimensional Superconductor K${}_2$Cr${}_3$As${}_3$

Abstract

We report ${}^{75}$As NMR measurements on the new quasi one-dimensional superconductor K${}_2$Cr${}_3$As${}_3$ ($T_c\sim 6.1$~K) [J.\ K.\ Bao et al., Phys. Rev. X {\bf 5}, 011013 (2015)]. We found evidence for strong enhancement of Cr spin fluctuations above $T_c$ in the [Cr${}_3$As${}_3$]${}_{\infty }$ double-walled subnano-tubes based on the nuclear spin-lattice relaxation rate $1/T_1$. The power law temperature dependence, $1/T_{1}T\sim T^{-\gamma }$ ($\gamma \sim 0.25$), is consistent with the Tomonaga-Luttinger liquid. Moreover, absence of the Hebel-Slichter coherence peak of $1/T_1$ just below $T_c$ suggests unconventional nature of superconductivity.

Final version accepted for publication in PRL

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