Bifurcations observed in the spectra of coupled electron-phonon modes in multiferroic $PrF{e}_3(B{O}_3{)}_4$ subjected to a magnetic field

Abstract

We report on bifurcations effect mediated by the electron-phonon coupling in a concentrated rare-earth-containing antiferromagnet, observed in the spectra of coupled $4f$-electron-phonon modes under the influence of an external magnetic field. The effect was observed in the low-temperature far-infrared (terahertz) reflection spectra of a multiferroic easy-axis antiferromagnet $PrF{e}_3(B{O}_3{)}_4$ in magnetic fields ${\text{B}}_{ext}||c$. Both paramagnetic and magnetically ordered phases (including a spin-flop one) were studied in magnetic fields up to 30 T. We show that the field behavior of the coupled modes can be successfully explained and modeled on the base of the equation derived in the frame of the theory of coupled electron-phonon modes, with the same field-independent electron-phonon interaction constant $|W|=14.8c{m}^{-1}$.

5 pages, 4 figures

References in corpus (4)

• Energy Dissipation and Transport in Nanoscale Devices
• Magnetization and specific heat of TbFe3(BO3)4: Experiment and crystal field calculations
• Infrared study of lattice dynamics and spin-phonon and electron-phonon interactions in multiferroic TbFe3(BO3)4 and GdFe3(BO3)4
• Splitting of a nondegenerate phonon mode in PrFe3(BO3)4: 4f crystal-field level between TO and LO phonon frequencies

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