Issues »  Volume 39, Issue 6

Response of Critical Temperature of the Superconducting Transition and Energy Gaps of MgB$_2$ to the Hydrostatic Compression

O. I. D’yachenko$^{1}$, V. Yu. Tarenkov$^{2}$, V. V. Kononenko$^{2}$

$^{1}$G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$Donetsk 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 MgB$_2$/Ag contacts is carried out. As shown, the pressure leads to a decrease in the superconducting energy gap for the $\sigma$-band and to a substantial increase in the energy gap for the $\pi$-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 MgB$_2$ crystals.

Key words: magnesium diboride, energy gaps in $\pi$- and $\sigma$-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 MgB$_2$ to the Hydrostatic Compression, Metallofiz. Noveishie Tekhnol., 39, No. 6: 719—731 (2017) (in Russian)

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