A paper on Rb2Mo3As3 – a Tomonaga-Luttinger Liquid with superconductivity

A paper was just published in PRB as Rapid Communication in which we explore Rb₂Mo₃As₃ using ⁸⁷Rb nuclear magnetic resonance (NMR) and ⁷⁵As nuclear quadrupole resonance (NQR).

We determine that Rb₂Mo₃As₃ is a Tomonaga-Luttinger Liquid (TLL) with attractive interactions (K_c = 1.4), while most of the known physical realizations of the TLL have repulsive interactions (K_c < 1). Rb₂Mo₃As₃ transitions to a bulk superconducting state at ~10K in absence of Hebel-Slichter coherence peak in the relaxation rates and a surprisingly small superconducting gap, measured in high magnetic fields using ⁸⁷Rb NMR.