Hg L3 edge absorption study of the HgBa2CuO4+δ superconductor
Ziyu Wu, N. L. Saini, A. Bianconi
DOI 10.1103/PhysRevB.64.092507 · Physical Review B
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Abstract
The HgBa2CuO4+δ superconductor has been studied by high resolution Hg L3 x-ray absorption near-edge structure (XANES) spectroscopy. The XANES spectrum has been simulated by full multiple-scattering calculations in order to explore the origin of different features in the experimental spectrum. The experimental Hg L3-edge spectrum could be well reproduced by considering a cluster of 85 atoms, containing 10 shells, within a radius of about 7 Å from the central Hg atom. The low energy spectral feature in the XANES spectrum is found to be due to a transition from the Hg p states to the electronic states hybridized with higher shell Ba atoms. This implies that the transition features in the Hg L3-edge XANES are strongly influenced by medium range order effects unlike the case of L3 edge of 3d transition metals where short-range order is enough to describe the main transition features.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure not reported | unknown |
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