Definitive Experimental Evidence for Two-Band Superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">M</mml:mi><mml:mi mathvariant="normal">g</mml:mi><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>

2003/03/31 by S. Tsuda, T. Yokoya, Yoshihiko Takano +11
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.91.127001

published as Phys. Rev. Lett. 91, 127001 (2003). · PDF file only

arxiv created 2003/03/31 · openalex publication_date 2003/09/17 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The superconducting-gap of MgB₂ has been studied by high-resolution angle-resolved photoemission spectroscopy. The results show that superconducting gaps with values of 5.5 and 2.2 meV open on the \ensuremathσ band and the \ensuremathπ band, respectively, but both the gaps close at the bulk transition temperature, providing a definitive experimental evidence for the two-band superconductivity with strong interband pairing interaction in MgB₂. The experiments validate the role of k-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature of MgB₂.

Citations

• Bardeen-Cooper-Schrieffer Theory of Superconductivity in the Case of Overlapping Bands

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