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Magnetism and EPR spectra of the two‐sublattice manganese chain Mn2(EDTA)⋅9H2O

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Magnetism and EPR spectra of the two‐sublattice manganese chain Mn2(EDTA)⋅9H2O

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Borrás Almenar, Juan José; Coronado Miralles, Eugenio; Gómez García, Carlos José; Gatteschi, S.; Zanchini, C.

Aquest document és un/a article, creat/da en: 1990

Este documento está disponible también en : http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JAPIAU000067000009006006000001&idtype=cvips&prog=normal&doi=10.1063/1.346045

We report on the magnetic behavior and single‐crystal EPR spectra of the chain complex Mn2(EDTA)⋅9H2O characterized by two different alternating sites for the manganese ions. Magnetic susceptibility data are indicative of weak antiferromagnetic exchange interactions between the manganese ions, showing a maximum of about 3 K. This behavior can be accurately described on the basis of a Heisenberg chain model that assumes classical spins, giving J/k=−0.72 K and g=2.0. The EPR spectra are typically low dimensional, with an angular dependence of the linewidth of the type (3 cos2 θ−1)n (n=4/3 or 2). Nevertheless, such a behavior cannot be reproduced from a one‐dimensional model with dipolar broadening. An alternative broadening mechanism arising from single‐ion zero‐field splitting is then suggested.

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