Spin transitions of Co ions in RCoOsub(3) (R=Gd,Tb) investigated by measuring the electric field gradient at R and Co sites
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Journal of Applied Physics
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Hyperfine interactions in perovskite-structure RCoO3 (R=Gd,Tb) compounds have been measured
by perturbed angular correlation technique using 111Cd and 181Ta nuclear probes. The electric
quadrupole interactions at 111Cd show two different sites, assigned to probe substituting Gd or Tb
and Co atoms. The temperature dependence of quadrupole frequencies shows discontinuities which
have been interpreted as thermally activated spin-state transitions from low-spin ground state
configuration to the intermediate-spin (IS) state and from IS state to high-spin state of Co3+ ion. For
181Ta only one major interaction was observed, which was assigned to probe at Co sites. Indication
of a Jahn-Teller distortion, which stabilizes the intermediate-spin state with orbital ordering, is also
pointed out.
Como referenciar
CARBONARI, A.W.; CAVALCANTE, F.H.M.; MALAVASI, R.F.L.; CABRERA PASCA, G.A.; MESTNIK FILHO, J.; SAXENA, R.N. Spin transitions of Co ions in RCoOsub(3) (R=Gd,Tb) investigated by measuring the electric field gradient at R and Co sites. Journal of Applied Physics, v. 103, n. 7, p. 07F708-1 - 07F708-3, 2008. DOI: 10.1063/1.2835066. Disponível em: http://repositorio.ipen.br/handle/123456789/4962. Acesso em: 20 Mar 2026.
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