Details

Autor(en) / Beteiligte

• Yang, F C
• Muñoz, J A
• Hellman, O
• Mauger, L
• Lucas, M S
• Tracy, S J
• Stone, M B
• Abernathy, D L
• Xiao, Yuming
• Fultz, B

Titel

Thermally Driven Electronic Topological Transition in FeTi

Ist Teil von

• Physical review letters, 2016-08, Vol.117 (7), p.076402-076402, Article 076402

Ort / Verlag

United States: American Physical Society (APS)

Erscheinungsjahr

2016

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• Ab initio molecular dynamics, supported by inelastic neutron scattering and nuclear resonant inelastic x-ray scattering, showed an anomalous thermal softening of the M_{5}^{-} phonon mode in B2-ordered FeTi that could not be explained by phonon-phonon interactions or electron-phonon interactions calculated at low temperatures. A computational investigation showed that the Fermi surface undergoes a novel thermally driven electronic topological transition, in which new features of the Fermi surface arise at elevated temperatures. The thermally induced electronic topological transition causes an increased electronic screening for the atom displacements in the M_{5}^{-} phonon mode and an adiabatic electron-phonon interaction with an unusual temperature dependence.