Speaker
Haraldur Gunnlaugsson
(Physics and Astronomy, Aarhus University, DK-8000 Århus C, Denmark)
Description
Prompted by the generally poor understanding [1,2] of the nature of magnetic phenomena in 3d-metal doped ZnO, we have undertaken on-line 57Fe Mössbauer spectroscopy at the ISOLDE facility at CERN on ZnO single crystal in an external magnetic field of 0.6 T, following implantation of radioactive 57Mn+ (T½ = 1.5 min.) ions at room temperature. The Mössbauer spectra of the dilute Fe impurities are dominated by sextets whose angular dependence rules out an ordered magnetic state, but are well accounted for on the basis of Fe3+ paramagnetic centres with long relaxation times.
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Author
Haraldur Gunnlaugsson
(Physics and Astronomy, Aarhus University, DK-8000 Århus C, Denmark)
Co-authors
G. Langouche
(Instituut voor Kern-en Stralings fysika, University of Leuven, B-3001 Leuven, Belgium)
G. Weyer
(Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Århus C, Denmark)
H. Masenda
(School of Physics, University of the Witwatersrand, WITS 2050, South Africa)
H. P. Gíslason
(Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland)
K. Bharuth-Ram
(School of Physics, University of KwaZulu-Natal, Durban 4001, South Africa)
K. Johnston
(PH Dept, ISOLDE/CERN, 1211 Geneva 23, Switzerland)
M. Fanciulli
(Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Milano, Italy)
R. Mantovan
(Laboratorio MDM, IMM-CNR, Via Olivetti 2, 20041 Agrate Brianza (MB), Italy)
R. Sielemann
(Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany)
S. Ólafsson
(Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland)
T. E. Mølholt
(Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland)
W. B. Dlamini
(School of Physics, University of KwaZulu-Natal, Durban 4001, South Africa)
Y. Kobayashi
(The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan)
