20.500.12556/RUL-148645 The pairing symmetry in quasi-one-dimensional superconductor $\mathrm{Rb_2 Mo_3 As_3}$ Quasi-one-dimensional electron systems display intrinsic instability towards long-range ordered phases at sufficiently low temperatures. The superconducting orders are of particular interest as they can possess either singlet or triplet pairing symmetry and frequently compete with magnetism. Here we report on muon spin rotation and relaxation ($\mu$SR) study of Rb$_2$Mo$_3$As$_3$ characterised by one of the highest critical temperatures $T_{\rm c}$ = 10.4 K among quasi-one-dimensional superconductors. The transverse-field $\mu$SR signal shows enhanced damping below $T_{\rm c}$ due to the formation of vortex lattice. Comparison of vortex lattice broadening against single gap $s$−, $p$− and $d$−wave models shows the best agreement for the $s$−wave scenario but with the anomalously small superconducting gap, $\Delta_0$, to $T_{\rm c}$ ratio of 2$\Delta_0∕k_{\rm B} T_{\rm c}$ = 2.74(1). The alternative nodal $p$−wave or $d$−wave scenarios with marginally worse goodness of fit would yield more realistic 2$\Delta_0∕k_{\rm B} T_{\rm c}$ = 3.50(2) and 2$\Delta_0∕k_{\rm B} T_{\rm c}$ = 4.08(1), respectively, and thus they cannot be ruled out when accounting for the superconducting state in Rb$_2$Mo$_3$As$_3$. solid state physics superconductivity unconventional superconductivity muon spin relaxation pnictides fizika trdne snovi superprevodnost true false true Angleški jezik Slovenski jezik Članek v reviji 2023-08-28 11:32:28 2023-08-28 11:32:29 2024-10-01 13:15:05 0000-00-00 00:00:00 2023 0 0 5 str. art. 111478 Vol. 181 Oct. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 538.9 0022-3697 10.1016/j.jpcs.2023.111478 155028739 1-s2.0-S0022369723002688-main.pdf 1-s2.0-S0022369723002688-main.pdf 1 4D26DE602BDA05FE6D87CBC62D666166 0b73a96369f98290fd9c54af01f6786941d540eaac79221981f2bd4eb521a325 f692df6a-4585-11ee-a605-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172927 https://www.sciencedirect.com/science/article/pii/S0022369723002688 0 ef2a02ea-4585-11ee-a605-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172926 Fakulteta za matematiko in fiziko 0 0 0