Sep 12 – 17, 2010
CERN
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Electronic and structural properties of the α-Fe2O3:Ta semiconductor. Experimental EFG determination and ab initio calculations.

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500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

CH - 1211 Geneva 23 Switzerland
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POSTER Semiconductors, Metals and Insulators

Speaker

Dr Germán Nicolás Darriba (Departamento de Física e Instituto de Física La Plata (IFLP, CONICET-UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CC 67, 1900 La Plata, Argentina.)

Description

In this work we present results from Time-Differential Perturbed-Angular Correlations (PAC) experiments in α-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.
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Primary author

Dr Germán Nicolás Darriba (Departamento de Física e Instituto de Física La Plata (IFLP, CONICET-UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CC 67, 1900 La Plata, Argentina.)

Co-authors

Emiliano Luis Muñoz (Departamento de Física e Instituto de Física La Plata (IFLP, CONICET-UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CC 67, 1900 La Plata, Argentina.) Mario Rentería (Departamento de Física e Instituto de Física La Plata (IFLP, CONICET-UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CC 67, 1900 La Plata, Argentina.) Paul-Dieter Eversheim (Helmholtz-Institut für Strahlen- und Kernphysik (H-ISKP),Universität Bonn, Nussallee 1416, 53115 Bonn, Germany.)

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