Theory for phonon-induced superconductivity in MgB₂

TY - JOUR

T1 - Theory for phonon-induced superconductivity in MgB2

AU - Joas, C.

AU - Eremin, Ilya

AU - Manske, D.

AU - Bennemann, K. H.

PY - 2002/4/1

Y1 - 2002/4/1

N2 - 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,O) (i = π, σ). Our results provide an explanation of recent tunneling experiments. We get Hc2ab/Hc2c ≈ 3.9.

AB - 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,O) (i = π, σ). Our results provide an explanation of recent tunneling experiments. We get Hc2ab/Hc2c ≈ 3.9.

UR - http://www.scopus.com/inward/record.url?scp=0036538014&partnerID=8YFLogxK

M3 - Journal article

AN - SCOPUS:0036538014

SN - 0163-1829

VL - 65

SP - 1325181

EP - 1325184

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 13

M1 - 132518

ER -