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NMR Investigation of the Quasi One-dimensional Superconductor K$_{2}$Cr$_{3}$As$_{3}$

Authors
  • Zhi, H. Z.
  • Imai, T.
  • Ning, F. L.
  • Bao, Jin-Ke
  • Cao, Guang-Han
Type
Published Article
Publication Date
Mar 23, 2015
Submission Date
Jan 04, 2015
Identifiers
DOI: 10.1103/PhysRevLett.114.147004
Source
arXiv
License
Yellow
External links

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.

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