Isotope Effect on Electron-Phonon Interaction in Multiband Superconductor MgB2

Abstract

We investigate the effect of isotope substitution on the electron-phonon interaction in the multi-band superconductor MgB2 using tunable laser based Angle Resolved Photoemission Spectroscopy. The kink structure around 70 meV in the $\sigma$ band, which is caused by electron coupling to the E2g phonon mode, is shifted to higher binding energy by ~3.5 meV in Mg(10)B2 and the shift is not affected by superconducting transition. These results serve as the benchmark for investigations of isotope effects in known, unconventional superconductors and newly discovered superconductors where the origin of pairing is unknown.

5 pages, 4 figures

References in corpus (5)

• Definitive experimental evidence for two-band superconductivity in MgB2
• An Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates
• Tunable VUV laser based spectrometer for Angle Resolved Photoemission Spectroscopy (ARPES)
• Anharmonicity and self-energy effects of the E2g phonon in MgB2
• Strong interaction between electrons and collective excitations in multiband superconductor MgB2

Cited by in corpus (3)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Isotope engineering of carrier mobility via Fröhlich electron-phonon interaction
• Effects of magnetic and non-magnetic doping on the vortex lattice in MgB${}_2$