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
E-mail: gornostaeva.olga.dn@gmail.com

Received June 20, 2017, revised Jule 19, 2017

Abstract

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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