Detection of electromagnetic multipoles by x-ray spectroscopiesReport as inadecuate

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1 IPR - Institut de Physique de Rennes 2 LC - Laboratoire de cristallographie

Abstract : Following a brief discussion on electromagnetic multipole expansion, we provide a link between several multipole moments and the measurable quantities of some x-ray spectroscopies, like resonant x-ray scattering RXS or dichroism in absorption. A general classification is given, accompanied by some specific examples and a geometrical interpretation of the axial toroidal non-magnetic quadrupole, related to the x-ray natural circular dichroism. Finally, in order to provide a physical example for the detection of magnetic parity-odd multipoles, like the toroidal moment, we perform a numerical simulation for x-ray non-reciprocal directional dichroism, at Fe K edge, in the polar ferrimagnet GaFeO3. Our calculations describe quite well the reported experimental profile, with the correct order of magnitude for dichroism-absorption intensity-ratio and a signal which is limited to pre-edge.

Author: S. Di Matteo - Y. Joly - C. R. Natoli



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