Surface electronic structures of superconducting thin film MgB2(0001)
In Gee Kim, J. I. Lee, B. I. Min, A. J. Freeman
DOI 10.1103/PhysRevB.64.020508 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
Similar papers
Electronic and dynamical properties of the MgB2 surface: Implications for the superconducting properties
similarity 0.98G. Profeta et al.
Source status unknown — claims are unverified
Surface contribution to the superconducting properties of MgB2 single crystals
similarity 0.97A. Rydh et al.
Source status unknown — claims are unverified
High-field superconductivity in alloyed MgB2 thin films
similarity 0.97V. Braccini et al.
Source status unknown — claims are unverified
Observation of superconductivity in thick amorphous MgxB1−x films
similarity 0.97S. Okuma et al.
Source status unknown — claims are unverified
Shape resonances and shell effects in thin-film multiband superconductors
similarity 0.96Aurelio Romero-Bermúdez & Antonio M. García-García
Source status unknown — claims are unverified
Suppression of superconducting critical current density by small flux jumps in MgB2 thin films
similarity 0.96Z. W. Zhao et al.
Source status unknown — claims are unverified