The pairing symmetry in quasi-one-dimensional superconductor $\mathrm{Rb_2 Mo_3 As_3}$

Gosar, Žiga (avtor), Arh, Tina (avtor), Jaksetič, Kevin (avtor), Zorko, Andrej (avtor), Liu, Wenhao (avtor), Wu, Hanlin (avtor), Wang, Chennan (avtor), Luetkens, Hubertus (avtor), Lv, Bing (avtor), Arčon, Denis (avtor)

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$_3$.

• Jezik: Angleški jezik
• Ključne besede: solid state physics, superconductivity, unconventional superconductivity, muon spin relaxation, pnictides
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2023
• Št. strani: 5 str.
• Številčenje: Vol. 181, art. 111478
• PID: 20.500.12556/RUL-148645
• UDK: 538.9
• ISSN pri članku: 0022-3697
• DOI: 10.1016/j.jpcs.2023.111478
• COBISS.SI-ID: 155028739
• Datum objave v RUL: 28.08.2023

Gradivo je del revije

• Naslov: The journal of physics and chemistry of solids
• Skrajšan naslov: J. phys. chem. solids
• Založnik: Elsevier
• ISSN: 0022-3697
• COBISS.SI-ID: 25778944

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fizika trdne snovi, superprevodnost