Pressure-Dependent Magnetic Properties of Quasi-2D Cr₂Si₂Te₆ and Mn₃Si₂Te₆

Abstract

Recently, pressure has been used to induce structural and magnetic phase transitions in many layered quantum materials whose layers are linked by van der Waals forces. Materials with such weakly held layers allow for relatively easy manipulation of the superexchange mechanism, which can give rise to novel magnetic behavior. Using hydrostatic pressure as a disorderless means to manipulate the interlayer coupling, we applied pressure on two quasi-2D sister compounds, namely, Cr 2 Si 2 Te 6 (CST) and Mn 3 Si 2 Te 6 (MST), up to ∼1 GPa. Magnetic property measurements with the application of pressure revealed that the ferromagnetic transition temperature decreases in CST, while the opposite occurs for the ferrimagnetic MST. In MST, magnetization decreases with the increase in pressure, and such a trend is not clearly observed within the pressure range studied for CST. The overall pressure effect on magnetic characteristics such as exchange couplings and magnetic anisotropy energies is also examined theoretically using density functional theory. Exchange coupling in MST is strongly frustrated, and the first nearest neighbor interaction is the most dominant of the components with the strongest pressure dependence. In CST, the exchange coupling parameters exhibit very little dependence on pressure. This combined experimental and theoretical work has the potential to expand to other relevant quantum materials.

High-temperature concomitant metal-insulator and spin-reorientation transitions in a compressed nodal-line ferrimagnet Mn3Si2Te6

“…S4). This behavior is also consistent with recent reports on the enhancement of T c with pressure 27,28 . The pressuredependent T c data estimated from ρ ab (T) and χ(T) match well with each other, firmly constructing a dome-shaped T c variation with a maximum T c close to room temperature (Fig.…”

Spin–Phonon Coupling and Magnetic Transition in an Organic Molecule Intercalated Cr2Ge2Te6

“…The recent discoveries of few-layer and monolayer 2D van der Waals (vdW) crystals such as Cr 2 Ge 2 Te 6 (CGT), CrI 3 , and Fe 3 GeTe 2 reveal the existence of long-range ferromagnetic order at low temperatures. However, achieving room temperature ferromagnetism involves the effective control of their magnetism by tuning the interlayer magnetic coupling with carrier doping, strain, pressure, electric fields, and photoexcitation and, more recently, through cation intercalation . The intercalation of foreign ions in the vdW magnet opens the possibility of manipulating magnetism and carrier dynamics by electron–phonon coupling (EPC) and spin–phonon coupling (SPC) mechanisms, respectively.…”