Fizika Nizkikh Temperatur: Volume 44, Number 1 (January 2018), p. 66-73    ( to contents , go back )

Local magnetic anisotropy of the rare-earth elements in iron-containing oxypnictides RFeAsO (R = Сe, Nd, Sm)

O.V. Gornostaeva1,2, K.V. Lamonova3, S.M. Orel3, and Yu.G. Pashkevich3

1Institute for Metal Physics, Kyiv 03142, Ukraine

2Donetsk National University, Vinnytsia 21021, Ukraine

3Donetsk Institute for Physics and Engineering, Kyiv 03028, Ukraine

Received June 20, 2017, revised Jule 19, 2017


We report a detailed study of the single-ion magnetic anisotropy of the rare-earth ions in the RFeAsO (R = Сe, Nd, Sm). Energy levels and g-factor values, temperature dependences of magnetic susceptibility components and fourth-order anisotropy constant were calculated by modified crystal field approach. A method for determining the single-ion easy direction has been proposed. It was shown, that the Се3+ and Nd3+ ions easy directions in orthorhombic phase are [100] and [010], correspondently. In tetragonal phase the easy direction is [110] for the both ions. In the case of the Sm3+ ion the easy direction is [001] irrespectively to the phase symmetry.

PACS: 75.30.Gw Magnetic anisotropy;
PACS: 71.70.Ch Crystal fields level splitting;
PACS: 75.10.Dg Crystal field theory and spin Gamiltonian.

Key words: rare-earth oxypnictides, modified crystal field theory, single-ion magnetic anisotropy.

Published online: November 28, 2017

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