Journal
PHYSICAL REVIEW B
Volume 93, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.144504
Keywords
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
- U.S. Department of Energy by Iowa State University [DE-AC02-07CH11358]
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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 sigma band, which is caused by electron coupling to the E-2g phonon mode, is shifted to higher binding energy by similar to 3.5 meV in (MgB2)-B-10 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.
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