Superconductivity properties of compound MgB2 on basis of two-band model
The theory of thermodynamic properties of two-band superconductor with reduced den- sity of charge carriers is developed on the basis of phonon superconducting mechanism with strong electron-phonon interaction. This theory is adapted to describe the behavior of critical temperature TC, energy gap...
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| Main Authors: | , |
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| Format: | article |
| Language: | EN |
| Published: |
D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2007
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| Subjects: | |
| Online Access: | https://doaj.org/article/28a945d7f7e947558d17a81eec5f8629 |
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| Summary: | The theory of thermodynamic properties of two-band superconductor with reduced den-
sity of charge carriers is developed on the basis of phonon superconducting mechanism with
strong electron-phonon interaction.
This theory is adapted to describe the behavior of critical temperature TC, energy gaps
Δ1, Δ2, and the relative jump of electron specific heat (CS-CN)/CN in the point T = TC along
with the variation of charge carrier density in the compound MgB2 when substitutional impurities with different valence are introduced into the system. It is shown, that according to the
filling mechanism of energy bands which overlap on the Fermi surface, the quantities TC, Δ1,
Δ2 decrease when this compound is doped with electrons and remain constant or weakly
change when the system is doped with holes. The theory qualitatively agrees with the experimental data.
It is also shown that the consideration of inter- and intraband scattering of electrons on
impurity potential improves this agreement. |
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