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  • Title: Resonant inelastic x-ray scattering as a probe of the phase and excitations of the order parameter of superconductors.
    Author: Marra P, Sykora S, Wohlfeld K, van den Brink J.
    Journal: Phys Rev Lett; 2013 Mar 15; 110(11):117005. PubMed ID: 25166567.
    Abstract:
    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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