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Pressure Effects and Large Polarons in Layered MgB_2 Superconductor | | V.A.Ivanov
; M.A.Smondyrev
; J.T.Devreese
; | | Date: |
16 Jun 2002 | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | We consider the dependence of the MgB_2 superconducting critical temperature on the pressure. Our model exploits the influence of the large polarons on the band structure of the layered MgB_2 superconductor. Namely, the hole Pekar-Froehlich polarons form quasi two-dimensional potential wells in the boron plane which 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 happens inside polaron wells. The results obtained are as follows: dT_c/dp = -alpha (5.2 pm 0.9) K/GPa or dT_c/dp = -alpha (6.9pm 1.1) K/GPa for a different choice of the Grueneisen parameter. Being compared with known experimental data they give us a resonable interval for the value of the Froehlich electron-phonon coupling constant: alpha = 0.15 - 0.45. | | Source: | arXiv, cond-mat/0206300 | | Services: | Forum | Review | PDF | Favorites | |
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