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2 Materials Science Poland

2 2006

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Magnetic ordering schemes in R3T4X4 compounds

Wawrzyńska E., Szytuła A.

Materials Science Poland

2006

Vol. 24, No. 3

543--549

This work is an attempt of a systematization of the magnetic structures of the R3T4X4 (R - a rare earth atom, T - a transition metal, X - a p-electron element) compounds investigated by means of neutron diffraction in the course of a broader research programme . The experiments were performed for twenty samples containing Pr, Nd, Tb, Dy, Ho and Er. Although the determined structures display a huge variety, some regularities were found for them. The authors try to use different approaches in order to elucidate the observed behaviors and come to some conclusions concerning the factors responsible for the found magnetic ordering schemes.

Electronic structure of the intermetallic rare earth compounds

Szytuła A., Gomółka D., Jezierski A., Penc B., Wawrzyńska E., Winiarski A.

Materials Science Poland

2006

Vol. 24, No. 3

557--561

The electronic structures of intermetallic rare earth compounds of different compositions: RMn2Ge2 (R = Nd, Sm), R3Mn4Sn4 (R = La, Ce, Nd), Ce3Ag4X4 (X = Ge, Sn), and Ce2MnGe6, have been investigated. XPS measurements were performed using a commercial LHS10 spectrometer. The valence band and core-level states have been analysed. In Mn compounds, the Mn 3d state forms a broad band near the Fermi level. The analysis of XPS spectra using the Gunnarsson-Schönhammer model gives the coupling parameters (hybridisation energy) between the R 4f states and electrons of the conduction band