Superconductivity of metallic boron in MgB2.
By J. Kortus, I. Mazin, K. Belashchenko, V. Antropov, L. L. Boyer. Physical Review Letters, 2001
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Boron in MgB2 forms stacks of honeycomb layers with magnesium as a space filler. Band structure calculations indicate that Mg is substantially ionized, and the bands at the Fermi level derive mainly from B orbitals. Strong bonding with an ionic component and considerable metallic density of states yield a sizable electron-phonon coupling. Together with high phonon frequencies, which we estimate via zone-center frozen phonon calculations to be between 300 and 700 cm(-1), this produces a high critical temperature, consistent with recent experiments. Thus MgB2 can be viewed as an analog of the long sought, but still hypothetical, superconducting metallic hydrogen.
Subfields: Condensed Matter Physics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7b3dbc3c5de58a85fb4705059e843f6ed0a05815
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In Condensed Matter Physics
In Materials Chemistry
Citations in the corpus
- Magnetic penetration depth in unconventional superconductors (2006, neutral): “Figure reprinted with permission from [117].”
- Two-band superconductor magnesium diboride (2008, methodology): “The two gaps arise from the existence of two bands, the σ and π bands of the boron electrons [9].”