Depth-resolved resonant inelastic x-ray scattering at a superconductor/half-metallic-ferromagnet interface through standing wave excitation
Cheng-Tai Kuo, Shih-Chieh Lin, Giacomo Ghiringhelli, Yingying Peng, Gabriella Maria De Luca, Daniele Di Castro, Davide Betto, Mathias Gehlmann, Tom Wijnands, Mark Huijben, Julia Meyer-Ilse, Eric Gullikson, Jeffrey B. Kortright, Arturas Vailionis, Nicolas Gauquelin, Johan Verbeeck, Timm Gerber, Giuseppe Balestrino, Nicholas B. Brookes, Lucio Braicovich, Charles S. Fadley
DOI 10.1103/PhysRevB.98.235146 · Physical Review B
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Abstract
We demonstrate that combining standing wave (SW) excitation with resonant inelastic x-ray scattering (RIXS) can lead to depth resolution and interface sensitivity for studying orbital and magnetic excitations in correlated oxide heterostructures. SW-RIXS has been applied to multilayer heterostructures consisting of a superconductor La1.85Sr0.15CuO4 (LSCO) and a half-metallic ferromagnet La0.67Sr0.33MnO3 (LSMO). Easily observable SW effects on the RIXS excitations were found in these LSCO/LSMO multilayers. In addition, we observe different depth distribution of the RIXS excitations. The magnetic excitations are found to arise from the LSCO/LSMO interfaces, and there is also a suggestion that one of the dd excitations comes from the interfaces. SW-RIXS measurements of correlated-oxide and other multilayer heterostructures should provide unique layer-resolved insights concerning their orbital and magnetic excitations, as well as a challenge for RIXS theory to specifically deal with interface effects.
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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