Surface electronic structures of superconducting thin film MgB2(0001)

I. G. Kim, J. I. Lee, B. I. Min, Arthur J Freeman

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The surface electronic structures of superconducting MgB2 were investigated using the all-electron full-potential linearized augmented plane-wave method. Hexagonal (0001) surfaces with both B terminated (B-Term) and Mg terminated (Mg-Term) were considered. Due to the nearly-free-electron nature of the Mg surface layer, the vacuum screening range of Mg-Term is shorter than that of B-Term, which shows the covalent bonding nature of the B surface layer. Considerably enhanced densities of states near the Fermi level are found at the surface layers especially for B-Term, which is expected to yield an enhanced superconductivity in the surface of thin film MgB2 over that in bulk - assuming no large changes in the electron-ion matrix elements and phonon frequency contributions. While this expectation is contrary to the weakened superconductivity observed in surface-oriented experiments, we attribute this discrepancy to extrinsic surface effects.

Original languageEnglish
Article number020508
Pages (from-to)205081-205084
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number2
Publication statusPublished - 2001

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Superconducting films
Electronic structure
electronic structure
thin films
surface layers
superconductivity
Superconductivity
Electrons
free electrons
plane waves
electrons
screening
Fermi level
vacuum
matrices
Screening
Vacuum
Ions
ions
Thin films

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Surface electronic structures of superconducting thin film MgB2(0001). / Kim, I. G.; Lee, J. I.; Min, B. I.; Freeman, Arthur J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 2, 020508, 2001, p. 205081-205084.

Research output: Contribution to journalArticle

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