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

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arxiv cond-mat/0504077 v2 pith:C3JP7OUM submitted 2005-04-04 cond-mat.supr-con cond-mat.mtrl-sci

Malgorzata Wierzbowska , Stefano de Gironcoli , Paolo Giannozzi This is my paper · ORCID
classification cond-mat.supr-concond-mat.mtrl-sci
keywords discontinuitieshigh-pressureanomalybandchangelow-niobiumstructure
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abstract

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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Cited by 3 Pith papers

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