Effects of pressure on the superconducting properties of magnesium diboride
X. J. Chen, H. Zhang, H.-U. Habermeier
DOI 10.1103/PhysRevB.65.144514 · Physical Review B
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Abstract
We discuss the effects of hydrostatic pressure on the superconducting properties of MgB2 within the framework of the Eliashberg theory. By considering the pressure dependences of all parameters appearing in the McMillan formula, we show that the calculated pressure derivative of Tc as well as the variation of Tc with pressure are in good agreement with recent measurements. The pressure dependences of the energy gap Δ0, the effective interaction strength N(EF)v, the critical magnetic field Hc(0), and the electronic specific-heat coefficient γ are also predicted for this system. A comparison of the pressure effects in nontransition elements clearly suggests that MgB2 is an electron-phonon-mediated superconductor.
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. | 40 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39.2 | Pressure unresolved | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.4 | Pressure unresolved | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | 25 GPa | unknown |
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