Raman scattering from phonons and magnons in RFe3)BO3)4

Abstract

Inelastic light scattering spectra of several members of the RFe3(BO3)4 family reveal a cascade of phase transitions as a function of temperature, starting with a structural, weakly first order, phase transition followed by two magnetic phase transitions. Those consist of the ordering of the Fe-spin sublattice revealed by all the compound, and a subsequent spin-reorientational transition for GdFe3(BO3)4. The Raman data evidence a strong coupling between the lattice and magnetic degrees of freedom in these borates. The Fe-sublattice ordering leads to a strong suppression of the low energy magnetic scattering, and a multiple peaked two-magnon scattering continuum is observed. Evidence for short-range correlations is found in the `paramagnetic' phase by the observation of a broad magnetic continuum in the Raman data, which persists up to surprisingly high temperatures.

17 pages, 13 figures

References in corpus (1)

• Evidence for differentiation in the iron-helicoidal-chain in GdFe${}_3$(BO${}_3$)${}_4$

Cited by in corpus (4)

• Magnetoelectric Effect and Spontaneous Polarization in HoFe${}_3$(BO${}_3$)${}_4$ and Ho${}_{0.5}$Nd${}_{0.5}$Fe${}_3$(BO${}_3$)${}_4$
• Optical spectra, crystal-field parameters, and magnetic susceptibility of the new multiferroic NdFe3(BO3)4
• Non-Resonant X-ray Magnetic Scattering on Rare-Earth Iron Borates RFe${}_3$(BO${}_3$)${}_4$
• A Raman study of the Charge-Density-Wave State in A${}_{0.3}$MoO${}_3$ (A = K,Rb)