Dataset Product Numbers
DEO Contract Number
Originating Research Organization
Ames Laboratory (AMES), Ames, IA (United States)
Country of Publication
SC USDOE Office of Science (SC)
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
We investigate the effect of isotope substitution on electron-phonon interaction in multi-band superconductor MgB$_2$ using tunable laser based Angle Resolved Photoemission Spectroscopy. The kink structure around 70 meV in Sigma band, which is caused by electron coupling to E_2g phonon mode, is shifted to higher binding energy by ~3.5 meV in Mg^10B2. The changes of the kink energy reported here suggest that the anharmonicity of the E2g phonon in MgB2 is very small, which reopens the debate about the unusually small isotope coefficient in this material. These results are the benchmark for investigation of isotope effect in known, unconventional superconductors and newly discovered superconductors where the origin of pairing is unknown.
Dataset File Extension
Kaminski, Adam; Mou, Daixiang; Canfield, Paul C.; Budko, Serguei; Huang, Lunan; Taufour, Valentin; Wu, Yun; and Manni, Soham, "Isotope Effect on Electron-Phonon Interaction in Multiband Superconductor MgB2" (2016). Ames Laboratory Datasets. 5.