Definitive experimental evidence for two-band superconductivity in MgB2

Details Definitive experimental evidence for two-band superconductivity in MgB2 Definitive experimental evidence for two-band superconductivity in MgB2

2003-03-31

arxiv.org/abs/cond-mat/0303636v1

Phys. Rev. Lett. 91, 127001 (2003).

Physics

Condensed Matter

Superconductivity

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Scientific paper

10.1103/PhysRevLett.91.127001

The superconducting gap of MgB2 has been studied by high-resolution angle-resolved photoemission spectroscopy (ARPES). The momentum(k)-resolving capability of ARPES enables us to identify the s- and p-orbital derived bands predicted from band structure calculations and to successfully measure the superconducting gap on each band. The results show that superconducting gaps with values of 5.5 meV and 2.2 meV open on the s-band and the p-band, respectively, but both the gaps close at the bulk transition temperature, providing a definitive experimental evidence for the two-band superconductivity in MgB2. The experiments validate the role of k-dependent electron-phonon coupling as the origin of multiple-gap superconductivity in MgB2.

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