Origins of low- and high-pressure discontinuities of $T_{c}$ in niobium

Details Origins of low- and high-pressure discontinuities of $T_{c}$ in niobium Origins of low- and high-pressure discontinuities of $T_{c}$ in niobium

2005-04-04

arxiv.org/abs/cond-mat/0504077v2

Physics

Condensed Matter

Superconductivity

Scientific paper

The discontinuities of $T_{c}$ in Niobium under pressure are examined by means of the pseudopotential plane-wave implementation of the electron-phonon coupling calculated from density-functional perturbation theory. Both low- and high-pressure discontinuities of $T_{c}$ have their origin in the Kohn anomalies and are caused by the low-frequency phonons, but the mechanism leading to the discontinuities is different in the two cases. The low-pressure anomaly is associated with a global decrease of the nesting factor in the whole Brillouin Zone and not to a visible change in the band structure. The high-pressure anomaly is instead connected with a well-pronounced change in the band structure.

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