Low Temperature Physics: 32, 735 (2006); https://doi.org/10.1063/1.2219496 (13 pages)
Fizika Nizkikh Temperatur: Volume 32, Number 8-9 (August 2006), p. 968-984    ( to contents , go back )

Rare-earth ferroborates RFe3(BO3)4 (Review Article)

A.N. Vasiliev and E.A. Popova

The Moscow State University М.В. Lomonosov , Moscow, 119992, Russia
E-mail: anvas2000@yahoo.com; eapopova@yahoo.com
pos Анотація:

Received March 6, 2006

Abstract

The review of physical properties of the compounds belonging to a family of rare-earth ferroborates RFe3(BO3)4 is given. At high temperatures, some of these compounds show the first order structural phase transition from the high symmetry modification R32 to the low symmetry one P3121. The temperature of this transition decreases with increasing the rare-earth ions size. The iron subsystem in every member of this family of compounds experiences antiferromagnetic ordering at low temperatures, while the rare-earth subsystem remains paramagnetic down to the lowest temperatures, it being polarized by the magnetic field of the ordered iron subsystem. The Neel temperature TN = 20–40 K depends weakly on the kind of rare-earth ion, but these ions determine the orientation of magnetic moments of the iron ions with respect to crystallographic axes. In Y, Nd, Er and Tm-based compounds the Fe magnetic moments are oriented in the ab-plane, while in Tb and Dy-based compounds they are parallel to the c-axis. In the GdFe3(BO3)4 compound the first order spin-reorientation transition takes place at TSR ~ 9 K. It is found that the GdFe3(BO3)4 and NdFe3(BO3)4 compounds exhibit multiferroic properties manifested in the magnetoelastic and magnetoelectric effects dependent on both orientation and external magnetic field.

PACS:
71.27.+a - Strongly correlated electron systems; heavy fermions
71.30.+h - Metal-insulator transitions and other electronic transitions
71.70.-d - Level splitting and interactions (see also 73.20.-r Surface and interface electron states; 75.30.Et Exchange and superexchange interactions)
75.30.-m - Intrinsic properties of magnetically ordered materials (for critical point effects, see 75.40.-s)
78.30.-j - Infrared and Raman spectra (for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.+x respectively)

Key words: multiferroics, phase transitions, ferroborates.

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