Reaction and disruption for Fe/La1.85Sr0.15CuO4: Interface formation for high-temperature superconductors
J. H. Weaver, Y. Gao, T. J. Wagener, B. Flandermeyer, D. W. Capone, II
DOI 10.1103/PhysRevB.36.3975 · Physical Review B
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Abstract
Inverse photoemission studies of the interface formed when Fe is deposited onto the high-Tc superconductor La1.85Sr0.15CuO4 show that Fe leaches oxygen from the near-surface region to form insulating Fe-O. This reduces the number of Cu 3p−O 2p antibonding electronic states straddling the Fermi level. The Fe-induced depletion continues until the nominal Fe coverage reaches ≈8 Å, at which point reaction is kinetically limited and a metallic Fe overlayer grows. Insight into the evolving near-surface environment of La is obtained through chemical shifts observed for the empty La 4f levels. Line-shape decompositions for these atomiclike empty states provide information analogous to that obtained with core-level photoemission.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
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