Condensed-Matter Physics & Materials Science Seminar

"Magnetic and structural properties of Ce(Pd,Pt)2Al2 intermetallics"

Presented by Petr Dole┼żal, Charles University, Czech Republic

Thursday, March 4, 2021, 12:00 pm — Bldg. 734 (Virtual)

Magnetic excitations are frequently studied to explain magnetic properties of intermetallic compounds. The standard crystal electric field theory is usually sufficient for a description of excitations. On the other hand, there are few Ce compounds like CePd2Al2, CeCuAl3 and CeAuAl3, where this attitude does not work. The explanation was found in assuming the coupling between 4f electrons and phonons. This coupling forms a new set of quantum states, which are beyond the Born–Oppenheimer approximation, and takes attention of scientists in last years.
The seminar will be focused on physical and structural properties of CePd2Al2 and its Pt homolog. Both compounds crystalize in CaBe2Ge2 structural type. The instability of structure at low temperatures leads to the structural transition and decreases symmetry in the basal plane. Main part will be focused on phonon dispersion curves study of CePd2Al2 by inelastic x-ray scattering. The results will be discussed in terms of enhanced magneto-elastic interaction.

Hosted by: Ian Robinson

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