ISOTOPE-SHIFT EXPONENT IN THE POLARONIC MODEL OF SUPERCONDUCTORS

Authors
BANERJEE S DAS AN RAY DK
Citation
S. Banerjee et al., ISOTOPE-SHIFT EXPONENT IN THE POLARONIC MODEL OF SUPERCONDUCTORS, Physics letters. A, 214(1-2), 1996, pp. 89-94
Citations number
13
Categorie Soggetti
Physics
Journal title
Physics letters. A → ACNP
ISSN journal
03759601
Volume
214
Issue
1-2
Year of publication
1996
Pages
89 - 94
Database
ISI
SICI code
0375-9601(1996)214:1-2<89:IEITPM>2.0.ZU;2-W
Abstract
We have studied the isotope-shift exponent (alpha) within the polaroni c theory of superconductivity as functions of electron-phonon coupling and carrier concentration. alpha is found to be consistently negative for all concentrations and electron-phonon couplings in contrast to e xperimental reports. Increasing Coulomb repulsion or use of a singular density of states pushes alpha to more negative values.