Momentum-dependent scanning tunneling spectroscopy in MgB{sub 2}.

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We present study of the anisotropic superconductor MgB{sub 2} using a combination of scanning tunneling microscopy and spectroscopy. The results reveal two distinct energy gaps at {Delta}{sub 1} = 2.3 meV and {Delta}{sub 2} = 7.1 meV. Different spectral weights of the partial superconducting density of states are a reflection of different tunneling directions in this multi-band system. Our experimental observations are consistent with the existence of two-band superconductivity in the presence of interband superconducting pair interaction and quasiparticle scattering. Temperature evolution of the tunneling spectra follows the BCS scenario with both gaps vanishing at the bulk T{sub c}. The ... continued below

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Karapetrov, G.; Iavarone, M.; Koshelev, A. E.; Kwok, W. K.; Crabtree, G. W.; Hinks, D. G. et al. July 31, 2002.

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We present study of the anisotropic superconductor MgB{sub 2} using a combination of scanning tunneling microscopy and spectroscopy. The results reveal two distinct energy gaps at {Delta}{sub 1} = 2.3 meV and {Delta}{sub 2} = 7.1 meV. Different spectral weights of the partial superconducting density of states are a reflection of different tunneling directions in this multi-band system. Our experimental observations are consistent with the existence of two-band superconductivity in the presence of interband superconducting pair interaction and quasiparticle scattering. Temperature evolution of the tunneling spectra follows the BCS scenario with both gaps vanishing at the bulk T{sub c}. The data confirm the importance of Fermi-surface sheet dependent superconductivity in MgB{sub 2} proposed in the multigap model by Liu et al. [1].

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  • 23rd International Conference on Low Temperature Physics, Hiroshima (JP), 08/20/2002--08/27/2002

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  • Report No.: ANL/MSD/CP-108355
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 799854
  • Archival Resource Key: ark:/67531/metadc738252

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  • July 31, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 25, 2016, 1:45 p.m.

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Karapetrov, G.; Iavarone, M.; Koshelev, A. E.; Kwok, W. K.; Crabtree, G. W.; Hinks, D. G. et al. Momentum-dependent scanning tunneling spectroscopy in MgB{sub 2}., article, July 31, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc738252/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.