Screening of the electron-phonon coupling in Nb-doped SrTiO3.

Authors
Jarlborg, T
Citation
T. Jarlborg, Screening of the electron-phonon coupling in Nb-doped SrTiO3., INT J MOD B, 13(29-31), 1999, pp. 3525-3527
Citations number
4
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
ISSN journal
02179792 → ACNP
Volume
13
Issue
29-31
Year of publication
1999
Pages
3525 - 3527
Database
ISI
SICI code
0217-9792(199912)13:29-31<3525:SOTECI>2.0.ZU;2-X
Abstract
The electronic part of the electron-phonon coupling, lambda, in pure and Nb -doped SrTiO3 has been calculated using the LMTO method. Supercells and the virtual crystal approximation has been used to treat the cases with dilute Nb-doping. It is found that the long-range part of the coupling is only we akly screened for low doping, when the material is close to be insulating. This makes the low-q part of lambda large and can explain the appearance of superconductivity for low Nb concentration.