ISSN:
1572-9605
Keywords:
LiTi2O4
;
electron-phonon interaction
;
lattice dynamics
;
spectral functionα 2 F(ω)
;
Éliashberg equation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The lattice dynamics of an oxide spinel LiTi2O4 is studied by taking account of the electron-phonon (EP) interaction derived on the basis of the realistic tight-binding bands fitted to the first-principles bands. Due to the characteristic dependences of the EP interaction on wavevectors and vibrational modes, a remarkable frequency renormalization of the O vibrational modes, which hybridize with the Ti vibrational modes, is obtained over a wide region of the Brillouin zone. The overall features of the calculated phonon density of states are in agreement with those observed by the inelastic neutron scattering measurements. By using the EP interaction and the renormalized phonon frequencies we have calculated the EP spectral functionα 2 F(ω). The superconducting transition temperature, gap function, and tunneling spectra are calculated by solving the Éliashberg equation. The results agree well with the observations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00728458
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