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Issues »  Volume 39, Issue 6

Response of Critical Temperature of the Superconducting Transition and Energy Gaps of MgB2 to the Hydrostatic Compression

O. I. D’yachenko1, V. Yu. Tarenkov2, V. V. Kononenko2

1G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
2Donetsk Institute for Physics and Engineering Named after O.O. Galkin, NAS of Ukraine, 46 Nauky Ave., UA-03028 Kyiv, Ukraine

Received: 25.05.2017. Download: PDF

Effect of high hydrostatic pressures (up to 15 kbar) on the spectrum of Andreev reflection within the MgB2/Ag contacts is carried out. As shown, the pressure leads to a decrease in the superconducting energy gap for the σ-band and to a substantial increase in the energy gap for the π-band. In this case, a significant increase in the excess current of the current–voltage characteristic of the contact is observed. A possible reason for such a response of the spectroscopic characteristics of magnesium diboride to hydrostatic compression is the pressure-induced intensive scattering of electrons by mobile edge dislocations in MgB2 crystals.

Key words: magnesium diboride, energy gaps in π- and σ-bands, high hydrostatic pressure.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i06/0719.html

DOI: https://doi.org/10.15407/mfint.39.06.0719

PACS: 74.25.F-, 74.25.Kc, 74.45.+c, 74.62.Dh, 74.62.Fj, 74.70.Ad

Citation: O. I. D’yachenko, V. Yu. Tarenkov, and V. V. Kononenko, Response of Critical Temperature of the Superconducting Transition and Energy Gaps of MgB2 to the Hydrostatic Compression, Metallofiz. Noveishie Tekhnol., 39, No. 6: 719—731 (2017) (in Russian)

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