Abstract
Polarization‐ and temperature‐dependent Raman data along with theoretical simulations are presented for the Kagome ferromagnet . Eight out of nine expected phonon modes are identified. The experimental energies compare well with those from the simulations. The analysis of the line widths indicates relatively strong phonon–phonon coupling in the range 0.1–1. The temperature‐dependent frequencies of three modes show weak anomalies at ≈100 K. In contrast, the linewidths of all phonon modes follow the conventional exponential broadening up to room temperature except for the softest mode, whose width exhibits a kink close to 100 K and becomes nearly constant for . These features are indicative of a spin reorientation taking place in the temperature range above 100 K, which might arise from spin–phonon coupling. The low‐energy part of the electronic continuum in symmetry depends strongly on temperature. The possible reasons include particle–hole excitation tracking the resistivity, a spin‐dependent gap, or spin fluctuations.
Highlights
Introduction simulations are presented for theKagome ferromagnet Fe3Sn2
The main focus of the article is placed on the analysis of the phonon modes in the temperature range of the reorientation of the Fe spins
We have studied the Kagome ferromagnet Fe3Sn2 using polarized Raman scattering
Summary
Fe3Sn2 single crystals were grown by the chemical transport reaction method. After 4–6 weeks of transport, the single crystals, having a plate-like form with a thickness in the range 20–40 μm along the c-axis and 3–5 mm in the ab-plane (see inset of Figure 1b), were found in the hot part of ampoule. The sample used for the experiments had a residual resistance ratio of RRR 1⁄4 29.3 (Figure 1b), indicating high crystalline quality. At low temperatures the c-axis becomes harder than the in-plane direction with χab=χc % 1.2 at 2 K. After witnessing the spin reorientation in magnetic and transport properties, the Raman spectroscopic study of Fe3Sn2, which is the main subject of this work, is turned to
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