Resonant X-ray Scattering Study of Rare-Earth Tetraborides

Sungdae Ji, University of Virginia

Resonant x-ray scattering has been one of the fascinating techniques to investigate microscopic nature of magnetic ordering and anisotropic charge distribution in strongly correlated system. In principle, The RXS process involves electric multipole transitions by exciting a core electron of a corresponding absorption edge of an element to an empty valence shell of intermediate state. Direct involvement of this valence electron state gives rise to an enhanced sensitivity to the target ion's 1)spin polarization and 2)anisotropic charge distributions like structural ATS and orbital ordering. On the other hand, RXS has been suggested as a more advantageous spectroscopic tool than a conventional absorption spectroscopy due to the unique element and site specificity. In this talk, it will be presented how two different RXS phenomena can be combined and how possibility of the spectroscopy can be realized in rare-earth tetraborides (RB4, R=Gd and Dy) which have magnetic order and anisotropic charge distribution due to structural ATS and quadrupole order. Moreover, a direct experimental evidence of the quadrupole-strain interaction which has been accepted phenomenologically as magneto-elastic properties will be presented.

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