Resonant Inelastic X-Ray Scattering as a Probe of the Phase and Excitations of the Order Parameter of Superconductors

Jeroen van den Brink; Krzysztof Wohlfeld; Pasquale Marra; Steffen Sykora

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Resonant Inelastic X-Ray Scattering as a Probe of the Phase and Excitations of the Order Parameter of Superconductors

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arxiv 1212.0112 v2 pith:TLPW5LO5 submitted 2012-12-01 cond-mat.supr-con cond-mat.str-el

Pasquale Marra , Steffen Sykora , Krzysztof Wohlfeld , Jeroen van den Brink This is my paper · ORCID

classification cond-mat.supr-concond-mat.str-el

keywords scatteringsuperconductorsexcitationsproberixselementaryinelasticpairing

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The capability to probe the dispersion of elementary spin, charge, orbital, and lattice excitations has positioned resonant inelastic x-ray scattering (RIXS) at the forefront of photon science. Here we develop the scattering theory for RIXS on superconductors, calculating its momentum-dependent scattering amplitude. Considering superconductors with different pairing symmetries, we show that the low-energy scattering is strongly affected by the superconducting gap and coherence factors. This establishes RIXS as a tool to disentangle pairing symmetries and to probe the elementary excitations of unconventional superconductors.

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