Tailoring the normal and superconducting state properties of ternary scandium tellurides, Sc$_6M$Te$_2$ ($M = $ Fe, Ru and Ir) through chemical substitution
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2025
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| author | Graham, J. N. Yuchi, K. Sazgari, V. Doll, A. Mielke III, C. Kral, P. Gerguri, O. Islam, S. S. Pomjakushin, V. Medarde, M. Luetkens, H. Okamoto, Y. Guguchia, Z. |
| author_facet | Graham, J. N. Yuchi, K. Sazgari, V. Doll, A. Mielke III, C. Kral, P. Gerguri, O. Islam, S. S. Pomjakushin, V. Medarde, M. Luetkens, H. Okamoto, Y. Guguchia, Z. |
| contents | 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$_6M$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$_6M$Te$_2$ compounds. These results classify the Sc$_6M$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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_06063 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tailoring the normal and superconducting state properties of ternary scandium tellurides, Sc$_6M$Te$_2$ ($M = $ Fe, Ru and Ir) through chemical substitution Graham, J. N. Yuchi, K. Sazgari, V. Doll, A. Mielke III, C. Kral, P. Gerguri, O. Islam, S. S. Pomjakushin, V. Medarde, M. Luetkens, H. Okamoto, Y. Guguchia, Z. Superconductivity Materials Science Strongly Correlated Electrons 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$_6M$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$_6M$Te$_2$ compounds. These results classify the Sc$_6M$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. |
| title | Tailoring the normal and superconducting state properties of ternary scandium tellurides, Sc$_6M$Te$_2$ ($M = $ Fe, Ru and Ir) through chemical substitution |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2502.06063 |