title: 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}∼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 T_{c} in the [Cr_{3}As_{3}]_{∞} double-walled subnanotubes based on the nuclear spin-lattice relaxation rate 1/T_{1}. The power-law temperature dependence, 1/T_{1}T∼T^{-γ} (γ∼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 an unconventional nature of superconductivity.
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S4M1, Canada.
authors.forename: H Z
authors.initials: HZ
authors.lastname: Zhi
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S4M1, Canada.|Canadian Institute for Advanced Research, Toronto, Ontario M5G1Z8, Canada.
authors.forename: T
authors.initials: T
authors.lastname: Imai
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou 310027, China.|Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: F L
authors.initials: FL
authors.lastname: Ning
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou 310027, China.|Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Jin-Ke
authors.initials: JK
authors.lastname: Bao
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou 310027, China.|Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Guang-Han
authors.initials: GH
authors.lastname: Cao