Correlation between magnetic properties and electronic structure in Ce and Eu intermetallic compounds probed by XAS and RIXS

Orateur : Alexander YAROSLAVTSEV (Nationale Research Nuclear University MEPhl, Moscow, Russia)

The compounds of rare-earth and transition metals exhibit fascinating physical properties, such as Kondo effect, heavy-fermion behavior, superconductivity, multiple magnetic transitions etc., which emerge from the complex interplay between strongly localized and itinerant valence states. Various methods have been developed in recent years in order to study the electronic structure of such compounds with high accuracy. This talk will focus on the probe of the electronic structure in few systems containing Ce and Eu and transition metal ions by means of X-ray absorption spectroscopy and resonant inelastic X-ray scattering. The compounds in question include rare-earth cobalt pnictides RCo2X2 (R = rare-earth, X = pnictogen) appealing from the magnetism point of view. Magnetic ordering in such electronically delocalized systems is dictated by the peculiarities of electronic band structure at the Fermi level, which can be easily affected, e.g. by external or chemical pressure. The talk will discuss in detail both the treatment of experimental XANES and RIXS data and correlation between the resulting electronic structure and magnetic properties of compounds. The attention will be paid to the extraction of rare-earth intermediate valence, the parameter representing the extent of 4f-shell instability and the depth of interaction between itinerant 3d and localized 4f electron states.

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