We report magnetization and Raman spectroscopy study on single crystals of VOCl,a van der Waals antiferromagnetic material.Magnetization measurement confirms an antiferromagnetic transition at 79 K and a magnetic easy...We report magnetization and Raman spectroscopy study on single crystals of VOCl,a van der Waals antiferromagnetic material.Magnetization measurement confirms an antiferromagnetic transition at 79 K and a magnetic easy axis along crystallographic a direction.The temperature-dependent Raman spectrum reveals five peaks at 30 K.Below the Neel temperature TN,the Raman-active modes 247 cm^(−1) and 404 cm^(−1) remarkably deviate from the standard Boltzmann function,which is ascribed to the strong magnetoelastic coupling between spins and phonons.We further observe an anomaly in 383 cm^(−1) mode at around 150 K.This coincides with the broad maximum in VOCl’s magnetic susceptibility,suggesting a development of short-ranged magnetic order at this temperature.展开更多
The behavior of lattice distortion in spin 1/2 antiferromagnetic XY models with random magnetic modulation is investigated with the consideration of spin-phonon coupling in the adiabatic limit. It is found that lattic...The behavior of lattice distortion in spin 1/2 antiferromagnetic XY models with random magnetic modulation is investigated with the consideration of spin-phonon coupling in the adiabatic limit. It is found that lattice distortion relies on the strength of the random modulation. For strong or weak enough spin phonon couplings, the average lattice distortion may decrease or increase as the random modulation is strengthened. This may be the result of competition between the random magnetic modulation and the spin phonon coupling.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.U2032213,U1832214,and 11774352)。
文摘We report magnetization and Raman spectroscopy study on single crystals of VOCl,a van der Waals antiferromagnetic material.Magnetization measurement confirms an antiferromagnetic transition at 79 K and a magnetic easy axis along crystallographic a direction.The temperature-dependent Raman spectrum reveals five peaks at 30 K.Below the Neel temperature TN,the Raman-active modes 247 cm^(−1) and 404 cm^(−1) remarkably deviate from the standard Boltzmann function,which is ascribed to the strong magnetoelastic coupling between spins and phonons.We further observe an anomaly in 383 cm^(−1) mode at around 150 K.This coincides with the broad maximum in VOCl’s magnetic susceptibility,suggesting a development of short-ranged magnetic order at this temperature.
文摘The behavior of lattice distortion in spin 1/2 antiferromagnetic XY models with random magnetic modulation is investigated with the consideration of spin-phonon coupling in the adiabatic limit. It is found that lattice distortion relies on the strength of the random modulation. For strong or weak enough spin phonon couplings, the average lattice distortion may decrease or increase as the random modulation is strengthened. This may be the result of competition between the random magnetic modulation and the spin phonon coupling.
