Nodeless s-wave superconductivity in the $\alpha$ -Mn structure type noncentrosymmetric superconductor TaOs: a $\mu$ SR study

Abstract

Noncentrosymmetric superconductors can lead to a variety of exotic properties in the superconducting state such as line nodes, multigap behavior, and time-reversal symmetry breaking. In this paper, we report the properties of the new noncentrosymmetric superconductor TaOs, using muon spin relaxation and rotation measurements. It is shown using the zero-field muon experiment that TaOs preserve the time-reversal symmetry in the superconducting state. From the transverse field muon measurements, we extract the temperature dependence of λ(T ) which is proportional to the superfluid density. This data can be fit with a fully gapped s-wave model for α = ∆(0)/kBTc = 2.01 ± 0.02. Furthermore, the value of magnetic penetration depth is found to be 5919 ± 45 Å, which is consistent with the value obtained from the bulk measurements.

Electronic properties of α -Mn-type non-centrosymmetric superconductor Re5.5Ta under hydrostatic pressure

“…In addition, the H c2 (0) is higher than H p , yielding a Maki parameter, α M = √ 2H WHH c2 /H p > 1, indicating a significant paramagnetic pair-breaking effect [81] and suggesting the presence of SOC. In contrast, other α-Mntype NCS compounds such as Nb 0.5 Os 0.5 [78] and TaOs [79] have shown s-wave superconductivity with unbroken TRS and with α M < 1. The structural point groups relevant to Re-based superconductors have several irreducible representations capable of hosting TRS broken states with a singlet, triplet, or an admixture of singlet and triplet, pairing, independent of SOC strength.…”

Superconducting properties of new hexagonal and noncentrosymmetric cubic high entropy alloys

“…time-reversal symmetry breaking; a phenomenon considered as a crucial parameter to exhibit the unconventional superconducting nature in binary NC superconductors [24][25][26][27][28][29]. However, recent findings call into question the role of NC structure [30][31][32][33][34]; therefore, this combined study of centrosymmetric and NC crystal structure compounds provides a platform to test the hypothesis regarding the role of only the absence of an inversion center and disorder in the origin of unconventional superconductivity in HEAs as well. Moreover, the present study of both compounds will also provide a better understanding of the superconducting mechanism of HEAs based on 4d and 5d transition metals.…”

Temperature Induced Spin Polarization in Magnetically Stripped Ferromagnetic Film: The Coexisting Phases and the Two Regime Behavior

“…Chemical patterning of substrates results into various morphological structures like bridges, micelles, channels, laminar structures and droplets etc in confined geometries . There have been published simulation reports by different researchers and their groups, but evolution of morphological structure using Ising model for non‐conserved binary mixtures, giving rise to similar kind of patterns have not been studied and published, which may be of importance to design numerous magnetic and electronic devices.…”