Pressure effects and large polarons in layered MgB2 superconductor
V. A. Ivanov, M. A. Smondyrev, J. T. Devreese
DOI 10.1103/PhysRevB.66.134519 · Physical Review B
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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-Fröhlich polarons form quasi-two-dimensional potential wells in the boron plane that shift the positions of the σ and π bands. This energy shift depends on the pressure, and the Cooper pairing of the correlated σ electrons occurs inside polaron wells. The results obtained are as follows: dTc/dp≃-α(5.2±0.9) K/GPa or dTc/dp≃-α(6.9±1.1) K/GPa for a different choice of the Grüneisen parameter. When compared with known experimental data, these give results a resonable interval for the value of the Fröhlich electron-phonon coupling constant: α≃0.15–0.45.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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