Tailoring the normal and superconducting state properties of ternary scandium tellurides, Sc${}_{6}M$Te${}_2$ ($M=$ Fe, Ru and Ir) through chemical substitution

Abstract

The pursuit of a unifying theory for non-BCS superconductivity has faced significant challenges. One approach to overcome such challenges is to perform systematic investigations into superconductors containing \textit{d}-electron metals in order to elucidate their underlying mechanisms. Recently, the Sc${}_{6}M$Te${}_2$ ($M$ = d-electron metal) family has emerged as a unique series of isostructural compounds exhibiting superconductivity across a range of $3d$, $4d$, and $5d$ electron systems. In this study, we employ muon spin rotation, neutron diffraction, and magnetisation techniques to probe the normal and superconducting states at a microscopic level. Our findings reveal extremely dilute superfluid densities that correlate with the critical temperature ($T_{\mathrm{c}}$). Additionally, we identify high-temperature normal-state transitions that are inversely correlated with $T_{\mathrm{c}}$. Notably, in Sc${}_6$FeTe${}_2$, the superconducting pairing symmetry is most likely characterised by two nodeless gaps, one of which closes as electron correlations diminish in the Ru and Ir Sc${}_{6}M$Te${}_2$ compounds. These results classify the Sc${}_{6}M$Te${}_2$ compounds ($M$ = Fe, Ru, Ir) as unconventional bulk superconductors, where the normal-state transitions and superconducting properties are governed by the interplay between electron correlations and spin-orbit coupling of the d-electron metal.

arXiv comment11 pages, 10 figures

References in corpus (22)

• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Time-reversal symmetry-breaking charge order in a kagome superconductor
• musrfit: A free platform-independent framework for muSR data analysis
• Properties of the Ideal Ginzburg-Landau Vortex Lattice
• Ironing out the details of unconventional superconductivity
• Rich Nature of Van Hove Singularities in Kagome Superconductor CsV${}_3$Sb${}_5$
• Pressure-induced Reemergence of Superconductivity in Topological Kagome Metal CsV3Sb5
• Quantum states and intertwining phases in kagome materials
• Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr${}_2$RuO${}_4$ under uniaxial stress
• d-Wave Model for Microwave Response of High-Tc Superconductors
• The Strange Metal State of the Electron-Doped Cuprates
• Pressure-induced dimensional crossover in a kagome superconductor
• Proximity-Induced Odd-Frequency Superconductivity in a Topological Insulator
• Study of the magnetic penetration depth in RbOs_2O_6
• Superconductivity and Field-Induced Magnetism in SrFe_1.75Co_0.25As_2
• Magnetism and Disorder Effects on muSR Measurements of the Magnetic Penetration Depth in Iron-Based Superconductors
• Time-reversal invariant and fully gapped unconventional superconducting state in the bulk of the topological Nb0.25Bi2Se3
• Superconductivity in Ternary Scandium Telluride Sc6MTe2 with 3d, 4d, and 5d Transition Metals
• Probing the pairing symmetry in the over-doped Fe-based superconductor Ba_0.35Rb_0.65Fe_2As_2 as a function of hydrostatic pressure
• Designing the stripe-ordered cuprate phase diagram through uniaxial-stress

Cited by in corpus (1)

• Superconductivity in Ternary Zirconium Telluride Zr6RuTe2