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Electronic states of boron in superconducting MgB2 studied by11B NMR

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Abstract

Nuclear magnetic resonance (NMR) spectra and nuclear spin-lattice relaxation rateT −11 of11B have been measured in superconducting polycrystalline MgB2 with 7 onsc = 39.5 K. It is shown that (T 1T−1 and the Knight shiftK s are independent of temperature and nearly isotropic aboveT c. Both of these quantities are decreased gradually in going to the superconducting state. According to NMR data the density of states near the Fermi level is flat at the scale of about 500 K. Some conclusions on the orbital content of the density of states at the Fermi level were drawn and compared with the results of the band structure calculations.

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Authors and Affiliations

  1. Institute of Metal Physics, Russian Academy of Sciences, Ekaterinburg, Russian Federation

    A. P. Gerashenko, K. N. Mikhalev & S. V. Verkhovskii

  2. Institute of Solid State Chemistry, Russian Academy of Sciences, Ekaterinburg, Russian Federation

    T. V. D’yachkova, A. P. Tyutyunnik & V. G. Zubkov

Authors
  1. A. P. Gerashenko
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  2. K. N. Mikhalev
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  3. S. V. Verkhovskii
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  4. T. V. D’yachkova
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  5. A. P. Tyutyunnik
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  6. V. G. Zubkov
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Correspondence to A. P. Gerashenko.

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Gerashenko, A.P., Mikhalev, K.N., Verkhovskii, S.V. et al. Electronic states of boron in superconducting MgB2 studied by11B NMR. Appl. Magn. Reson. 21, 157–163 (2001). https://doi.org/10.1007/BF03162449

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  • DOI: https://doi.org/10.1007/BF03162449

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