Strongly correlated systems show very interesting properties, in particular those based on cerium. In the last decades such systems have been studied by different experimental as well as theoretical methodologies. In the present project, it is proposed a systematic study of the hyperfine interactions (through measurements of the magnetic hyperfine field and the electric field gradient) on rare-earth based inter-metallic compounds which present magnetic ordering, superconductivity or both. In particular, the following compounds will be investigated: Ce(PdxRh1-X)2Si2, CexGd1-xRh2Si2, PrxGd1-xRh2Si2, and NdxGd1-xRh2Si2. In these compounds cerium is a constituent element or a diluted impurity as probe nuclei (140Ce) for the perturbed angular correlation (PAC) measurements. PAC results will be correlated to magnetization measurements taken by SQUID magnetometer. Using the 140Ce probe nuclei (Only PAC can use Ce as probe to measure hyperfine interactions) it will be possible to better understand the role of 4f-electrons of Ce ions. 111In(111Cd) and 181Hf(181Ta) will also be used as probe nuclei to measure hyperfine fields at different crystalline sites in the samples, which will allow to characterize structural properties by means of hyperfine parameter data such as the electric field gradient and the asymmetry parameter. These data on magnetic hyperfine field (Bhf) will help to understand the matrix and cerium 4f electrons contributions to the Bhf. These probe nuclei will be introduced into previously X-ray characterized samples by established methodologies using arc-melting or diffusion.
News published in Agência FAPESP Newsletter about the scholarship: