Investigation of spin transition in GdCoOsub(3) by measuring the electric field gradient at Co sites
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Journal of Magnetism and Magnetic Materials
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In the present work, the time differential perturbed angular correlation (PAC) technique was used to study the temperature
dependence of electric field gradient (efg) in GdCoO3 perovskite using 111Cd and 181Ta nuclear probes. The radioactive parent nuclei 111In and 181Hf were introduced in the oxide lattice through chemical process during sample preparation and were found to occupy only
the Co sites in GdCoO3. The efg’s at 111Cd and 181Ta show temperature dependence with two different fractions each that change with
temperature. In the case of 111Cd the quadrupole frequency slowly decreases, with corresponding increase of the temperature and shows a
peak like structure at around 200 K and a discontinuity at 700 K. These changes have been interpreted as thermally activated spin-state
transitions from low-spin ground state configuration to the intermediate-spin state and from intermediate-spin to high-spin state of Co3þ
ion similar to LaCoO3 compound. Indication of a Jahn–Teller distortion, which stabilizes the intermediate-spin state with orbital
ordering, is also pointed out.
Como referenciar
CAVALCANTE, F.H.M.; CARBONARI, A.W.; MALAVASI, R.F.L.; CABRERA PASCA, G.A.; SAXENA, R.N.; MESTNIK FILHO, J. Investigation of spin transition in GdCoOsub(3) by measuring the electric field gradient at Co sites. Journal of Magnetism and Magnetic Materials, v. 320, n. 14, p. e32-e35, 2008. DOI: 10.1016/j.jmmm.2008.02.033. Disponível em: http://repositorio.ipen.br/handle/123456789/4964. Acesso em: 30 Dec 2025.
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