Determination of the magnetic structure of SmFe3(BO3)(4) by neutron diffraction: comparison with other RFe3(BO3)(4) iron borates

作者：Ritter C^*; Pankrats A; Gudim I; Vorotynov A

来源：Journal of Physics: Condensed Matter , 2012, 24(38): 386002.

DOI：10.1088/0953-8984/24/38/386002

Temperature dependent neutron diffraction studies were performed on SmFe3(BO3)(4). The crystallographic structure was determined to stay as R32 over the whole studied temperature range of 2 K < T < 300 K. A magnetic phase transition characterized by the magnetic propagation vector kappa = [003/2] takes place at T-N = 34 K. The magnetic structure sees an easy-plane arrangement within the trigonal basal a-b-plane of ferromagnetic layers of iron and samarium having a canting angle of about 70 degrees relative to each other. Neighbouring layers in the c-direction are antiferromagnetically coupled; at 2 K the magnetic moment values amount to mu(Fe) = 4.2(1) mu(B) and mu(Sm) = 0.8(2) mu(B). The non-Brillouin type increase of the iron magnetic moment below T-N points to a strong Fe-Sm exchange and to the simultaneous appearance of long range magnetic order on both sublattices.

• 出版日期2012-9-26