NbTi: A nontrivial puzzle for the conventional theory of superconductivity
Alessio Cucciari, Dionisia Naddeo, Simone Di Cataldo, Lilia Boeri
DOI 10.1103/PhysRevB.110.L140502 · Physical Review B
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Abstract
We present a comprehensive ab initio study of superconductivity in NbTi, the workhorse for many applications. Despite being a “textbook” material, 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 Tc compared to experiment. Our results imply that a quantitative description of technologically relevant superconductors requires methodological developments beyond the current standards.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbTi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.7 | Pressure not reported | unknown |
| NbTi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19.1 | 261.7 GPa | unknown |
| NbTi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.7 | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.3 | Pressure not reported | unknown |
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