The terahertz spectra of a rare-earth iron borate with the huntite structure are obtained for the first time. We study the low-temperature (4.0-90 K) α-polarized transmittance spectra of the EuFe3(BO 3)4 single crystal in the region 0.9-6.0 THz. Pronounced shifts of phonon frequencies and appearance of new phonon modes at the temperature TS=58 K of the R32→P3121 structural phase transition are observed. Additional shifts of phonon frequencies occur at the temperature TN=34 K of the magnetic ordering of the Fe subsystem, thus evidencing the spin-phonon coupling in this multiferroic material.
|Number of pages
|Physics Letters, Section A: General, Atomic and Solid State Physics
|Published - Jul 30 2012
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
- Europium iron borate
- Terahertz spectroscopy