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Magnetic structure in iron borates RFe~3~(BO~3~)~4~(R = Er, Pr): a neutron diffraction and magnetization study by C Ritter; A Vorotynov; A Pankrats; G Petrakovskii; V Temerov; I Gudim; R Szymczak is a Physics and Astronomy article available to read on EtoBox.

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Neutron diffraction, susceptibility and magnetization measurements (for R = Er only) were performed on iron borates RFe 3 (BO 3 ) 4 (R = Pr, Er) to investigate details of the crystallographic structure, the low temperature magnetic structures and transitions and to study the role of the rare earth anisotropy. PrFe 3 (BO 3 ) 4 , which crystallizes in the spacegroup R32, becomes antiferromagnetic at T N = 32 K, with τ = [0 0 3/2], while ErFe 3 (BO 3 ) 4 , which keeps the P3 1 21 symmetry over the whole studied temperature range 1.5 K < T < 520 K, becomes antiferromagnetic below T N = 40 K, with τ = [0 0 1/2]. Both magnetic propagation vectors lead to a doubling of the crystallographic unit cell in the c-direction. Due to the strong polarization of the Fe-sublattice, the magnetic ordering of the rare earth sublattices appears simultaneously at T N . The moment directions are determined by the rare earth anisotropy: easy-axis along c for PrFe 3 (BO 3 ) 4 and easy-plane a-b for ErFe 3 (BO 3 ) 4 . There are no spin reorientations present in either of the two compounds but there is the appearance below 10 K of a minority phase in the Er-compound adopting a 120 • arrangement of the Er-mome

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Author

C Ritter; A Vorotynov; A Pankrats; G Petrakovskii; V Temerov; I Gudim; R Szymczak

Publisher

IOP Publishing

Published

2010

Language

EN

Field

Physics and Astronomy (Physical Sciences)