Superconductivity in the regime of attractive interactions in the Tomonaga-Luttinger liquid

Abstract

While the vast majority of known physical realizations of the Tomonaga-Luttinger liquid (TLL) have repulsive interactions defined with the dimensionless interaction parameter $K_{\mathrm{c}}<1$, we here report that Rb${}_2$Mo${}_3$As${}_3$ is in the opposite TLL regime of attractive interactions. This is concluded from a TLL-characteristic power-law temperature dependence of the ${}^{87}$Rb spin-lattice relaxation rates over broad temperature range yielding the TLL interaction parameter for charge collective modes $K_{\mathrm{c}}=1.4$. The TLL of the one-dimensional band can be traced almost down to $T_{\mathrm{c}}=10.4$~K, where the bulk superconducting state is stabilized by the presence of a three-dimensional band and characterized by the ${}^{87}$Rb temperature independent Knight shift and the absence of Hebel-Slichter coherence peak in the relaxation rates. The small superconducting gap measured in high magnetic fields reflects either the importance of the vortex core relaxation or the uniqueness of the superconducting state stemming from the attractive interactions defining the precursor TLL.

arXiv comment6 pages, 4 figures. 5 figures and one table in supplemental material

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Cited by in corpus (3)

• Gapless spin-excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
• The pairing symmetry in quasi-one-dimensional superconductor Rb2Mo3As3
• A magnetic excitation linking quasi-1D Chevrel-type selenide and arsenide superconductors