Title Pressure effects and large polarons in layered $MgB_{2}$ superconductorPressure effects and large polarons in layered $MgB_{2}$ superconductor Author Ivanov, V.A. Smondyrev, M.A. Devreese, J.T. Faculty/Department Faculty of Sciences. Physics Research group Department of Physics Theory of quantum systems and complex systems Publication type article Publication 2002Lancaster, Pa, 2002 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