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Spectroscopic Properties of TbAsO 4
Author(s) -
Wüchner W.,
Bohm W.,
Kahle H. G.,
Kasten A.,
Laugsch J.
Publication year - 1972
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.2220540127
Subject(s) - tetragonal crystal system , zeeman effect , orthorhombic crystal system , anisotropy , condensed matter physics , phase transition , spectral line , symmetry (geometry) , phase (matter) , chemistry , crystallography , tensor (intrinsic definition) , magnetic field , physics , crystal structure , optics , mathematics , geometry , organic chemistry , quantum mechanics , astronomy , pure mathematics
Absorption spectra of Tb 3+ in TbAsO 4 , indicate that this material undergoes a Jahn‐Teller induced phase transition from tetragonal to a lower, probably orthorhombic, symmetry at T D = (25.5 ± 2.5) K. Zeeman spectra with the magnetic field in the basal plane taken below T D , show a large anisotropy which is caused not only by the g ‐factor but also by large internal fields. The g ‐tensor of the isolated two lowest singlets, which are separated less than 0.6 cm −1 at 1.74 K, is uniaxial with g 110 = 17.0 ± 1.0 in the [110] direction. Measurements down to 0.77 K show a magnetic phase transition at T N , = (1.48 ± 0.04) K to an antiferromagnetically ordered state which increases the splitting of the two lowest lying singlets up to (2.62 ± 0.06) cm −1 at 0.77 K.