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Electron Paramagnetic Resonance of Mn 2+ at the Three Sites of Yttrium Aluminium Garnet
Author(s) -
Hodges J. A.,
Dormann J. L.,
Makram H.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690350103
Subject(s) - yttrium , octahedron , crystallography , dodecahedron , electron paramagnetic resonance , yttrium aluminium garnet , tetrahedron , paramagnetism , materials science , chemistry , crystal structure , atomic physics , nuclear magnetic resonance , physics , condensed matter physics , metallurgy , oxide , doping
Electron paramagnetic resonance measurements have been made at 17.4 GHz at room and liquid helium temperatures of divalent manganese substituted into the three sites of yttrium aluminium garnet (YAlG). The relative intensities of the tetrahedral, octahedral, and dodecahedral spectra were respectively 3:2:30. Data at liquid helium temperatures in units of 10 −4 cm −1 are for tetrahedral site: g z = 2.001, B 2 0= −170.6, B 4 0= 0.062, A z = −69.1; for octahedral site: g z = 2.001, B 2 0= −139.3, B 4 0= −0.088, A z = −82.3; for dodecahedral site: g z = g y = 2.001, B 2 0= −102.2, B 2 2 = −167.8, B 4 0= −0.006, ( B 4 2+ B 4 4 ) = 0.11, A z = −85.1, A y = −85.9. The second order zero field splittings were compared to the various existing crystal field models using the local crystalline fields at the three sites obtained by summing up the contributions of the point monopoles to convergence. Poor agreement was obtained.