Theory for phonon-induced superconductivity in MgB2
C. Joas, I. Eremin, D. Manske, K. H. Bennemann
DOI 10.1103/PhysRevB.65.132518 · Physical Review B
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Abstract
We analyze superconductivity in MgB2 observed below Tc=39 K resulting from electron-phonon coupling involving a mode at ħω1=24 meV and, most importantly, the in-plane B-B E2g vibration at ħω2=67 meV. The quasiparticles originating from π and σ states couple strongly to the low-frequency mode and the E2g vibrations, respectively. Using two-band Eliashberg theory, λπ=1.4 and λσ=0.7, we calculate the gap functions Δi(ω,0) (i=π, σ). Our results provide an explanation of recent tunneling experiments. We get Hc2ab/Hc2c≈3.9.
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. | 39 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| AlB2 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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