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A Perturbed-Angular-Correlation Study of Hyperfine Interactions at 181Ta in α-Fe2O3

  • HFI probes in Semiconductors, Metals and Insulators
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Abstract

The hyperfine interactions at 181Ta ions on Fe3+ sites in α-Fe2O3 (hematite) were studied in the temperature range 11–1100 K by means of the perturbed angular correlation (PAC) technique. The 181Hf(β−)181Ta probe nuclei were introduced chemically into the sample during the preparation. The hyperfine interaction measurements allow to observe the magnetic phase transition and to characterize the supertransferred hyperfine magnetic field Bhf and the electric field gradient (EFG) at the impurity sites. The angles between Bhf and the principal axes of the EFG were determined. The Morin transition was also observed. The results are compared with those of similar experiments carried out using 111Cd probe.

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Authors and Affiliations

  1. Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, cc 67, 1900, La Plata, Argentina

    A. F. Pasquevich

  2. Instituto de Pesquisas Energéticas e Nucleares (IPEN), Sao Paulo, Brazil

    A. C. Junqueira, A. W. Carbonari & R. N. Saxena

Authors
  1. A. F. Pasquevich
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  2. A. C. Junqueira
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  3. A. W. Carbonari
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  4. R. N. Saxena
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Corresponding author

Correspondence to A. F. Pasquevich.

Additional information

aAlso at Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Argentina.

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Pasquevich, A.F., Junqueira, A.C., Carbonari, A.W. et al. A Perturbed-Angular-Correlation Study of Hyperfine Interactions at 181Ta in α-Fe2O3 . Hyperfine Interact 158, 371–375 (2004). https://doi.org/10.1007/s10751-005-9061-z

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  • DOI: https://doi.org/10.1007/s10751-005-9061-z

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