High-pressure effects on structural, magnetic, and vibrational properties of van der Waals antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>MnPS</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
Д. П. Козленко, O. N. Lis, N. T. Dang, Matthew J. Coak, J.-G. Park, Е. В. Лукин, С. Е. Кичанов, N. O. Golosova, I. Yu. Zel, Б. Н. Савенко
Abstract
The crystal structure, vibrational spectra, and magnetic structure of quasi-two-dimensional layered van der Waals material ${\mathrm{MnPS}}_{3}$ were studied using x-ray diffraction and Raman spectroscopy at high pressures up to 28 GPa, and neutron diffraction up to 3.6 GPa, respectively. A structural phase transition between two monoclinic modifications of the same $C2/m$ symmetry was observed, evolving gradually in the pressure range of about 1--6 GPa. The transition is accompanied by abrupt shortening of lattice parameters, significant reduction of the monoclinic distortion, and anomalies in the pressure behavior of several Raman-mode frequencies. No more structural phase transitions were revealed in the studied pressure range. The antiferromagnetic (AFM) state with a propagation vector $k$ = (0, 0, 0) remains stable in ambient pressure and high-pressure structural phases of ${\mathrm{MnPS}}_{3}$ at least up to 3.6 GPa. The N\'eel temperature increases noticeably with a pressure coefficient of $d{T}_{\mathrm{N}}/dP=6.7$ K/GPa, leading to modification of the dominant first-neighbor magnetic interaction exchange parameter with a relevant coefficient ${dJ}_{1}/dP\ensuremath{\approx}\ensuremath{-}0.6$ meV/GPa. This observation is in contrast to the pressure behavior of ${\mathrm{FePS}}_{3}$, demonstrating modification of the AFM state from 2D-like to 3D-like at the similar pressure-induced structural phase transition. The different pressure response of the magnetic states of ${\mathrm{MnPS}}_{3}$ and ${\mathrm{FePS}}_{3}$ is analyzed in terms of competing in-plane and interplane magnetic interactions.