INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Electronic and structural properties of the alfa-Fe2O3(Ta) semiconductor experimental EFG determination and ab initio calculations
G. N. DARRIBA; E. L. MUÑOZ; P. D. EVERSHEIM; M. RENTERÍA
CERN, Ginebra, Suiza.
Conferencia; HFI/NQI2010, 15th International Conference on Hyperfine Interactions & 19th International Symposium on Nuclear Quadrupole Interaction; 2010
Comité organizador de la reunión
In this work we present results from Time-Differential Perturbed-Angular Correlations (PAC) experiments in ¿-Fe2O3 singlecrystals (in their corundum structure) implanted with 181Hf(¨181Ta) ions at the ion accelerator facility of the H-ISKP at the Bonn University. The magnitude, asymmetry and orientation of the EFG were determined measuring the spin-rotation curves as a function of the singlecrystal orientation (for three different configurations of the sample) with respect to the laboratory system. The PAC experiments were carried out at 973 K in order to have only the electric-quadrupole interaction in the spectra, since above the Neel temperature (TN=955 K) the system has a paramagnetic behaviour.