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Observation of a magnetically controllable Jahn Teller distortion in dysprosium vanadate at low temperatures

At around 14 K DyVO 4 undergoes a crystallographic phase transition from tetragonal to a lower symmetry, very probably orthorhombic. It is proposed that the distortion arises from a Jahn Teller splitting of an accidently degenerate pair of low lying Dy 3+ doublets. The distortion direction is correl...

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Bibliographic Details
Published in:Solid state communications 1970-05, Vol.8 (9), p.689-692
Main Authors: Cooke, A.H., Ellis, C.J., Gehring, K.A., Leask, M.J.M., Martin, D.M., Wanklyn, B.M., Wells, M.R., White, R.L.
Format: Article
Language:English
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Summary:At around 14 K DyVO 4 undergoes a crystallographic phase transition from tetragonal to a lower symmetry, very probably orthorhombic. It is proposed that the distortion arises from a Jahn Teller splitting of an accidently degenerate pair of low lying Dy 3+ doublets. The distortion direction is correlated with the direction of principal g value and can be influenced by applied magnetic fields. In the orthorhombic phase DyVO 4 orders antiferromagnetically with a Néel temperature of 3.0 K. The direction of moment alignment is the basal plane. Le vanadate de dysprosium subit vers 14 K une transformation de phase allant de las symmétrie tétragonale à une symmetrie inférieure, très probablement orthorhombique. On propose que cette distortion est cause par le dédoublement Jahn Teller d'un pair de doublets degeneres de basse energie du Dy 3+. La direction de cette distortion est lieè a l'orientation du tenseur g et peut être influence par l'application d'un champs magnétiques. Dans sa phase orthorhombique le DyVO 4 est ordonné d'une facon antiferromagnetique avec une temperature de Néel egale à 3 K. Les moments sont alignes dans le plan de base.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(70)90196-1