Magnetic transitions in the positional isomers (4-HOPNN and 2-HOPNN) of an organic nitronyl nitroxide radical using muon–spin rotation

The zero-field muon–spin rotation/relaxation technique has been used in the direct observation of spontaneous magnetic order below the Curie temperature of T C∼500 mK in 2-hydroxyphenyl-α-nitronyl nitroxide (2-HOPNN) and two successive magnetic transitions in 4-hydroxyphenyl-α-nitronyl nitroxide (4-...

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Bibliographic Details
Published in:Chemical physics letters 1998-08, Vol.293 (3), p.160-166
Main Authors: Garcı́a-Muñoz, J.L., Cirujeda, J., Veciana, J., Cox, S.F.J.
Format: Article
Language:English
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Summary:The zero-field muon–spin rotation/relaxation technique has been used in the direct observation of spontaneous magnetic order below the Curie temperature of T C∼500 mK in 2-hydroxyphenyl-α-nitronyl nitroxide (2-HOPNN) and two successive magnetic transitions in 4-hydroxyphenyl-α-nitronyl nitroxide (4-HOPNN) at T C1≈700 and T C2∼100 mK. The different position of the hydroxyl group in these positional isomeric compounds causes different crystal packings and magnetic dimensionalities. The results reveal different magnetic transitions in these two α-nitronyl nitroxides radicals suggesting a 2D–3D magnetic crossover in 4-HOPNN.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(98)00756-8