Document Type

Dataset

Dataset Type

numeric_data

Dataset Product Numbers

None

DEO Contract Number

DE-AC02- 07CH11358

Originating Research Organization

Ames Laboratory (AMES), Ames, IA (United States)

Publication/Issue Date

4-19-2016

Language

English

Country of Publication

US

Sponsoring Organization(s)

SC USDOE Office of Science (SC)

Subject Categories

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Abstract

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.

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2.5Mb

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