Observation of spin-lattice relaxations of dilute Fe3+ in MgO by Mössbauer spectroscopy

T. E. Mølholt, R. Mantovan, H. P. Gunnlaugsson, D. Naidoo, S. Ólafsson, K. Bharuth-Ram, M. Fanciulli, K. Johnston, Y. Kobayashi, G. Langouche, H. Masenda, R. Sielemann, G. Weyer, H. P. Gíslason

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Abstract

We present a method to describe the temperature dependence of emission Mössbauer spectra showing slow spin-lattice relaxations of Fe3+ in MgO single crystals, obtained after implantation of 57Mn at ISOLDE/CERN. The analysis is based on the Blume-Tjon model for the line-shape of relaxing paramagnetic sextets with the spin relaxation rate, τ-1 as a parameter. The temperature dependent spin relaxation rate of Fe3+ in MgO is found to increase to ~108 s-1 at 647 K by assuming a relaxation rate of τ-1 < 106 s-1 at 77 K. The results are in accordance with those obtained by electron paramagnetic resonance spectroscopy demonstrating the possibility of retrieving spin-lattice relaxation rates of dilute Fe3+ from emission Mössbauer spectroscopy of Mn/Fe-implanted oxides.

Original languageEnglish
Pages (from-to)89-94
Number of pages6
JournalHyperfine Interactions
Volume197
Issue number1
DOIs
Publication statusPublished - 2010

Bibliographical note

Funding Information:
Acknowledgements The European Union Sixth Framework through RII3-EURONS is acknowledged for supporting this work. K. Bharuth-Ram, H. Masenda and D. Naidoo acknowledge support from the South African National Research Foundation. Financial support of the German BMBF (contract no. 05KK4TS1/9) is also gratefully acknowledged. R. Mantovan acknowledges support from the Cariplo Foundation (SPAM3 project, code no 2008.2363). T. E. Mølholt acknowledges support from the Icelandic Research Fund.

Other keywords

  • Dilute Fe
  • Emission Mössbauer spectroscopy
  • MgO
  • Spin-lattice relaxations

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