Phonon Anomalies Associated with Spin Reorientation in the Kagome Ferromagnet Fe3Sn2,Physica Status Solidi (B) - Basic Solid State Physics

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Phonon Anomalies Associated with Spin Reorientation in the Kagome Ferromagnet Fe3Sn2
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2021-08-24 , DOI: 10.1002/pssb.202100169
Ge He ₁ , Leander Peis ₁ , Ramona Stumberger _{1,

2} , Lilian Prodan ₃ , Vladimir Tsurkan ₃ , Nico Unglert ₄ , Liviu Chioncel ₄ , István Kézsmárki ₃ , Rudi Hackl _{1,

2}

Affiliation

Polarization- and temperature-dependent Raman data along with theoretical simulations are presented for the Kagome ferromagnet

{Fe}_{3} {Sn}_{2}

${Fe}_{3} {Sn}_{2}$ . 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

A_{1 g}

$A_{1 g}$ 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

A_{1 g}

$A_{1 g}$ mode, whose width exhibits a kink close to 100 K and becomes nearly constant for

T > 100 K

$T > 100 K$ . 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

E_{g}

$E_{g}$ symmetry depends strongly on temperature. The possible reasons include particle–hole excitation tracking the resistivity, a spin-dependent gap, or spin fluctuations.

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