Temperature and pressure manipulation of magnetic ordering and phonon dynamics with phase transition in multiferroic GdFeO 3 : Evidence from Raman scattering

摘要: We systematically investigate the detailed dynamics of phonon and local structure rare-earth orthoferrites ${\mathrm{GdFeO}}_{3}$ single crystal with temperature pressure induced structural/magnetic phase transition by Raman spectroscopy. Phonon evolution related to motion octahedra reveals paramagnetic antiferromagnetic ordering ${\mathrm{Fe}}^{3+}$ ions at N\'eel ${\phantom{\rule{4pt}{0ex}}T}_{N,Fe}$. By quantifying polarized spectra, especially cross-polarized geometry, lattice distortion rearrangement during ferromagnetic has been also discovered. Particularly, we claim that depolarization ratio could be quantified used precisely determine symmetry simultaneously. Additionally, dependence (up 25.03 GPa) collective behavior indicates antiphase tilt in ${\mathrm{FeO}}_{6}$ is more susceptible stress field than in-phase one. The presents better compressible ${\mathrm{GdO}}_{12}$ dodecahedra respect pressure. This work discovered physical mechanism underlying variation structural symmetry, tilt, ${\mathrm{GdFeO}}_{3}$, which can regarded as basic view for a series ${\mathrm{GdFeO}}_{3}$-type perovskites R${\mathrm{FeO}}_{3}$ system.