Unraveling the Symmetry of the Hole States near the Fermi Level in the MgB2 Superconductor
Y. Zhu, A. R. Moodenbaugh, G. Schneider, J. W. Davenport, T. Vogt, Q. Li, G. Gu, D. A. Fischer, J. Tafto
DOI 10.1103/PhysRevLett.88.247002 · Physical Review Letters
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Abstract
We use x-ray absorption spectroscopy (XAS) and electron energy loss spectroscopy (EELS) to study the fine structure at the K edge of boron in MgB2. We observe in XAS a peak of width 0.7 eV at the edge threshold, signaling a narrow energy region with empty boron p states near the Fermi level. The changes in the near edge structure observed in EELS with direction of the momentum transfer imply that these states have pxpy symmetry. Our observations are consistent with electronic structure calculations indicating a narrow energy window of empty pxpy states that falls to zero at 0.8 eV above the Fermi level. The disappearance of the pxpy feature in EELS at grain boundaries suggests that this signature may become powerful in probing superconductivity at nanoscale.
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 |
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