%0 Journal Article
%T Superconductivity in quasi-one-dimensional K$_2$Cr$_3$As$_3$ with significant electron correlations
%A Jin-Ke Bao
%A Ji-Yong Liu
%A Cong-Wei Ma
%A Zhi-Hao Meng
%A Zhang-Tu Tang
%A Yun-Lei Sun
%A Hui-Fei Zhai
%A Hao Jiang
%A Hua Bai
%A Chun-Mu Feng
%A Zhu-An Xu
%A Guang-Han Cao
%J Physics
%D 2014
%I arXiv
%R 10.1103/PhysRevX.5.011013
%X We report the discovery of bulk superconductivity (SC) at 6.1 K in a quasi-one-dimensional (Q1D) chromium pnictide K$_2$Cr$_3$As$_3$ which contains [(Cr$_3$As$_3$)$^{2-}$]$_{\infty}$ double-walled subnano-tubes with face-sharing Cr$_{6/2}$ (As$_{6/2}$) octahedron linear chains in the inner (outer) wall. The material has a large electronic specific-heat coefficient of 70$\sim$75 mJ K$^{-2}$ mol$^{-1}$, indicating significantly strong electron correlations. Signature of non-Fermi liquid behavior is shown by the linear temperature dependence of resistivity in a broad temperature range from 7 to 300 K. Unconventional SC is preliminarily manifested by the estimated upper critical field exceeding the Pauli limit by a factor of three to four. The title compound represents a rare example that possibly unconventional SC emerges in a Q1D system with strong electron correlations.
%U http://arxiv.org/abs/1412.0067v2