Die Austausch-Kopplung von Gd3+- und Cr3+-Ionen in paramagnetischem GdCrO3
Open Access
- 1 March 1986
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 41 (3) , 519-525
- https://doi.org/10.1515/zna-1986-0310
Abstract
Polycrystalline samples of stoichiometric GdCrO3 have been investigated by ESR at 9.4 GHz. In the temperature range between 175 K and 520 K one broad absorption with a Lorentzian line shape and a g-factor of 2.024 has been observed. Attributing the absorption exclusively to the Gd -ion it can be shown that the temperature dependence of the ESR-intensity follows the predictions of a cluster-model. The energy describing the coupling of a single Gd3+-ion to the surrounding Cr3+-ions is found to be ΔE(Gd) = 170 cm-1. Taking advantage of the similarity within the orthochromites it is possible to determine at the same time the exchange - coupling of Cr3+-ions to their identical nearest neighbours as ΔE(Cr) = 293 cm-1. The relative strength of these couplings given by 0.60 is compatible with other experimental issues.Keywords
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