Publication
Title
Pressure effects and large polarons in layered $MgB_{2}$ superconductor
Author
Abstract
 We consider the dependence of the MgB2 superconducting critical temperature on the pressure. Our model exploits the influence of the large polarons on the band structure of the layered MgB2 superconductor. Namely, the hole Pekar-Frohlich polarons form quasi-two-dimensional potential wells in the boron plane that shift the positions of the sigma and pi bands. This energy shift depends on the pressure, and the Cooper pairing of the correlated sigma electrons occurs inside polaron wells. The results obtained are as follows: dT(c)/dpsimilar or equal to-alpha(5.2+/-0.9) K/GPa or dT(c)/dpsimilar or equal to-alpha(6.9+/-1.1) K/GPa for a different choice of the Gruneisen parameter. When compared with known experimental data, these give results a resonable interval for the value of the Frohlich electron-phonon coupling constant: alphasimilar or equal to0.15-0.45.
Language
English
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Publication
Lancaster, Pa : 2002
ISSN
1098-0121 [print]
1550-235X [online]
Volume/pages
66:13(2002), 6 p.
Article Reference
134519
ISI
000179067900120
Medium
E-only publicatie
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address