Evidence of spin-phonon coupling in CrSiTe3

Abstract

We present the Raman scattering results on layered semiconducting ferromagnetic compound CrSiTe3. Four Raman active modes, predicted by symmetry, have been observed and assigned. The experimental results are supported by DFT calculations. The self-energies of the A 3 g and the E 3 g symmetry modes exhibit unconventional temperature evolution around 180 K. In addition, the doubly degenerate E 3 g mode shows clear change of asymmetry in the same temperature region. The observed behaviour is consistent with the presence of the previously reported short-range magnetic order and the strong spin-phonon coupling.

Efficient Spin‐Orbit Torque Switching of the Semiconducting Van Der Waals Ferromagnet Cr2Ge2Te6

“…Raman spectroscopy data were gathered to confirm the quality of the CGT films. Unlike the Raman spectra reported previously for CGT FETs, which were exposed to air, the Raman spectra of our CGT/Ta Hall bar devices (with 50 nm CGT) show sharp peaks at approximately 112 and 138 cm –1 (see Figure b), consistent with previously reported Raman spectra on single‐crystal CGT . Figure S2a , Supporting Information, shows a similar Raman spectrum for a device from a thinner CGT flake, indicating that our process flow does ensure high‐quality devices even when thinner CGT flakes are employed.…”

“…Unlike the Raman spectra reported previously for CGT FETs, which were exposed to air, [12] the Raman spectra of our Figure 2b), consistent with previously reported Raman spectra on single-crystal CGT. [13,14] Figure S2a , Supporting Information, shows a similar Raman spectrum for a device from a thinner CGT flake, indicating that our process flow does ensure high-quality devices even when thinner CGT flakes are employed. The surface roughness of the fabricated devices is in the sub-nanometer range even after the Ta deposition, further highlighting the process control achieved (see Figure S2b, Supporting Information).…”

Phonon anomalies and magnetic excitations inBaFe2Se2O

“…2(a). Having in mind small instrumental broadening, the analysis of the line-shape was preformed by using Fano function alone 20,21 :…”

Vacancies and spin–phonon coupling in CrSi0.8Ge0.1Te3

“…Raman scattering studies of CrSiTe 3 reveal strong spin–lattice coupling in the paramagnetic phase [ 15,21 ] as a consequence of a short‐range magnetic order in this compound. In addition to renormalization of energies and linewidths of observed Raman active modes, coupling of doubly degenerate E g mode with magnetic continuum was found.…”

“…In addition to renormalization of energies and linewidths of observed Raman active modes, coupling of doubly degenerate E g mode with magnetic continuum was found. [ 21 ] The coupling results in an asymmetric phonon line shape up to 180 K. Besides the splitting of two low‐energy E g modes in the magnetic phase of CrGeTe 3 and unconventional behaviour of phonon properties around transition temperature, experimental results indicate spin–phonon coupling effect with magnetic quasi‐elastic scattering. [ 22 ] Pressure‐dependent Raman scattering study of CrGeTe 3 showed a decrease in bond length, the deviation of Cr–Te–Cr angle, and reduction of phase transition temperature.…”