Isotope effect on electron-phonon interaction in the multiband superconductor MgB2

Daixiang Mou; Soham Manni; Valentin Taufour; Yun Wu; Lunan Huang; S. L. Bud'ko; P. C. Canfield; Adam Kaminski

doi:10.1103/PhysRevB.93.144504

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Isotope effect on electron-phonon interaction in the multiband superconductor MgB2

Daixiang Mou, Soham Manni, Valentin Taufour, Yun Wu, Lunan Huang, S. L. Bud'ko, P. C. Canfield, Adam Kaminski

DOI 10.1103/PhysRevB.93.144504 · Physical Review B

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Abstract

We investigate the effect of isotope substitution on the electron-phonon interaction in the multiband superconductor MgB2 using tunable laser-based angle-resolved photoemission spectroscopy. The kink structure around 70 meV in the σ band, which is caused by electron coupling to the E2g phonon mode, is shifted to higher binding energy by ∼3.5 meV in MgB102 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB112 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37.5	Pressure unresolved	onset
MgB102 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38.5	Pressure unresolved	onset
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown