Magnetic Behaviour and Electronic Structure of the R$\text{}_{2}$PdSi$\text{}_{3}$ (R = Ce, Nd, Tb-Er) Compounds

The magnetic properties including the magnetic structure were determined by magnetometric and neutron diffraction measurements of the polycrystalline samples of R$\text{}_{2}$ PdSi$\text{}_{3}$ (R = Ce, Nd, Tb-Er). In Ce$\text{}_{2}$PdSi$\text{}_{3}$ the Ce moments order below 2.5 K. The Nd magnetic moments in Nd$\text{}_{2}$PdSi$\text{}_{3}$ exhibit ferromagnetic ordering below 17 K. In Tb$\text{}_{2}$PdSi$\text{}_{3}$, a complex situation is observed: in the temperature range from 1.5 K to (T$\text{}_{N}$=25 K), there is a coexistence of a ferromagnetic spiral (about 75% of the magnetic moment) and a spin-glass (about 25%). For the Dy, Ho, and Er compounds, below T$\text{}_{N}$ (7.5, 8, and 7 K respectively), sinusoidally modulated structures are observed. The valence band and the core level photoemissions of 4d of rare-earth metal, 3d Pd, 2s and 2p Si were investigated by X-ray photoemission spectroscopy measurements.