NbTi: a nontrivial puzzle for the conventional theory of superconductivity
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866917622541451264 |
|---|---|
| author | Cucciari, Alessio Naddeo, Dionisia Di Cataldo, Simone Boeri, Lilia |
| author_facet | Cucciari, Alessio Naddeo, Dionisia Di Cataldo, Simone Boeri, Lilia |
| contents | We present the first $ab$-$initio$ study of superconductivity in NbTi, the workhorse for many applications. Despite its apparent simplicity, NbTi turns out to be a major challenge for computational superconductivity. In fact, anharmonic effects are crucial to obtain dynamically stable phonons for the ordered bcc phase, unstable at the harmonic level, and beyond-Morel Anderson effects in the Coulomb interaction reduce the Tc by more than 20%. Lattice disorder causes an additional large discrepancy in $T_c$ compared to experiment. Our results imply that a quantitative description of technologically-relevant superconductors requires methodological developments beyond the current standards. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_15196 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | NbTi: a nontrivial puzzle for the conventional theory of superconductivity Cucciari, Alessio Naddeo, Dionisia Di Cataldo, Simone Boeri, Lilia Superconductivity Materials Science We present the first $ab$-$initio$ study of superconductivity in NbTi, the workhorse for many applications. Despite its apparent simplicity, NbTi turns out to be a major challenge for computational superconductivity. In fact, anharmonic effects are crucial to obtain dynamically stable phonons for the ordered bcc phase, unstable at the harmonic level, and beyond-Morel Anderson effects in the Coulomb interaction reduce the Tc by more than 20%. Lattice disorder causes an additional large discrepancy in $T_c$ compared to experiment. Our results imply that a quantitative description of technologically-relevant superconductors requires methodological developments beyond the current standards. |
| title | NbTi: a nontrivial puzzle for the conventional theory of superconductivity |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2403.15196 |