Current browse context:
cond-mat.supr-con
Change to browse by:
References & Citations
Condensed Matter > Superconductivity
Title: NbTi: a nontrivial puzzle for the conventional theory of superconductivity
(Submitted on 22 Mar 2024 (v1), last revised 26 Mar 2024 (this version, v3))
Abstract: 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.
Submission history
From: Alessio Cucciari [view email][v1] Fri, 22 Mar 2024 13:31:26 GMT (2761kb,D)
[v2] Mon, 25 Mar 2024 15:28:22 GMT (2761kb,D)
[v3] Tue, 26 Mar 2024 10:43:30 GMT (2761kb,D)
Link back to: arXiv, form interface, contact.