Abnormal Hot Carrier Decay via Spin-Phonon Coupling in Intercalated van der Waals Ferromagnetic Fe<sub>1/3</sub>TaS<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 35549246.
- Also identified by DOI 10.1021/acs.nanolett.1c04064.
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Abstract
Spin-phonon coupling is a fundamental interaction in ferromagnets/antiferromagnets and plays a key role in hot carrier decay. Normally, spin transfers its excess energy to a lattice via spin-phonon coupling in hot carrier decay in ferromagnets/antiferromagnets. However, the reverse energy transfer process (i.e., from lattice to spin) is feasible in principle but rarely reported. Here, we observe an abnormal hot carrier decay with a slow fall (80 ps) in Δ<i>R</i>(<i>t</i>)/<i>R</i><sub>0</sub> time series in ferromagnet Fe<sub>1/3</sub>TaS<sub>2</sub>, which is a result of the lattice of TaS<sub>2</sub> vdW layer transfering its energy to spin via spin-phonon coupling. The Fe ions inserted between TaS<sub>2</sub> vdW layers with very weak bonding with TaS<sub>2</sub> vdW layer, are the origin of the ferromagnetism and give rise to its weak electron-spin and spin-phonon couplings which in turn lead to the observed abnormal hot carrier decay in the ferromagnetic phase Fe<sub>1/3</sub>TaS<sub>2</sub>.