Nodeless superconductivity and topological nodal states in molybdenum carbide
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866912014206500864 |
|---|---|
| author | Shang, Tian Wang, Yuting Yu, Bochen Xia, Keqi Gawryluk, Darek J. Xu, Yang Zhan, Qingfeng Zhao, Jianzhou Shiroka, Toni |
| author_facet | Shang, Tian Wang, Yuting Yu, Bochen Xia, Keqi Gawryluk, Darek J. Xu, Yang Zhan, Qingfeng Zhao, Jianzhou Shiroka, Toni |
| contents | The orthorhombic molybdenum carbide superconductor with $T_c$ = 3.2 K was investigated by muon-spin rotation and relaxation ($μ$SR) measurements and by first-principle calculations. The low-temperature superfluid density, determined by transverse-field $μ$SR, suggests a fully-gapped superconducting state in Mo$_2$C, with a zero-temperature gap $Δ_0$ = 0.44 meV and a magnetic penetration depth $λ_0$ = 291 nm. The time-reversal symmetry is preserved in the superconducting state, as confirmed by the absence of an additional muon-spin relaxation in the zero-field $μ$SR spectra. Band-structure calculations indicate that the density of states at the Fermi level is dominated by the Mo $4d$-orbitals, which are marginally hybridized with the C $2p$-orbitals over a wide energy range. The symmetry analysis confirms that, in the absence of spin-orbit coupling (SOC), Mo$_2$C hosts twofold-degenerate nodal surfaces and fourfold-degenerate nodal lines. When considering SOC, the fourfold-degenerate nodal lines cross the Fermi level and contribute to the electronic properties. Our results suggest that, similarly to other phases of carbides, also the orthorhombic transition-metal carbides host topological nodal states and may be potential candidates for future studies of topological superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_02380 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nodeless superconductivity and topological nodal states in molybdenum carbide Shang, Tian Wang, Yuting Yu, Bochen Xia, Keqi Gawryluk, Darek J. Xu, Yang Zhan, Qingfeng Zhao, Jianzhou Shiroka, Toni Superconductivity Strongly Correlated Electrons The orthorhombic molybdenum carbide superconductor with $T_c$ = 3.2 K was investigated by muon-spin rotation and relaxation ($μ$SR) measurements and by first-principle calculations. The low-temperature superfluid density, determined by transverse-field $μ$SR, suggests a fully-gapped superconducting state in Mo$_2$C, with a zero-temperature gap $Δ_0$ = 0.44 meV and a magnetic penetration depth $λ_0$ = 291 nm. The time-reversal symmetry is preserved in the superconducting state, as confirmed by the absence of an additional muon-spin relaxation in the zero-field $μ$SR spectra. Band-structure calculations indicate that the density of states at the Fermi level is dominated by the Mo $4d$-orbitals, which are marginally hybridized with the C $2p$-orbitals over a wide energy range. The symmetry analysis confirms that, in the absence of spin-orbit coupling (SOC), Mo$_2$C hosts twofold-degenerate nodal surfaces and fourfold-degenerate nodal lines. When considering SOC, the fourfold-degenerate nodal lines cross the Fermi level and contribute to the electronic properties. Our results suggest that, similarly to other phases of carbides, also the orthorhombic transition-metal carbides host topological nodal states and may be potential candidates for future studies of topological superconductivity. |
| title | Nodeless superconductivity and topological nodal states in molybdenum carbide |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.02380 |