Spin-lattice relaxations of paramagnetic Fe 3+ in ZnO

T. E. Mølholt*, H. P. Gunnlaugsson, K. Johnston, R. Mantovan, H. Masenda, D. Naidoo, K. Bharuth-Ram, H. P. Gislason, G. Langouche, R. Sielemann, G. Weyer, Sveinn Ólafsson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The spin-lattice relaxation rate of paramagnetic Fe 3+ in single-crystalline ZnO has been determined following low-fluence (Φ<10 12 cm -2) 60 keV implantation of 57Mn + (T 1/2=1.5 min) and emission Mössbauer spectroscopy on the 57Fe daughter nucleus in the temperature range from 300 to 664 K. The spin-lattice relaxation of Fe 3+ is found to follow a T 9 temperature dependence, in contrast to the T 2 dependence expected for a two-phonon Raman process determined in both single-crystal MgO and α-Al 2O 3 using the same analysis method of the Mössbauer spectra measured without an applied external magnetic field. This is an unexpected result since ZnO has a lower Debye temperature than both MgO and α-Al 2O 3.

Original languageEnglish
Article number014006
JournalPhysica Scripta
Issue numberT148
DOIs
Publication statusPublished - Mar 2012

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