Title
Pressure effects and large polarons in layered <tex>$MgB_{2}$</tex> superconductor Pressure effects and large polarons in layered <tex>$MgB_{2}$</tex> superconductor
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Volume/pages
66(2002) :13 , 6 p.
ISSN
1098-0121
1550-235X
1098-0121
ISI
000179067900120
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/d94b7e/7815.pdf
E-info
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000179067900120&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000179067900120&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000179067900120&DestLinkType=CitingArticles&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848
Handle