Strong effects of uniaxial pressure and short-range correlations in Cr2Ge2Te6

Abstract

Cr${}_2$Ge${}_2$Te${}_6$ is a quasi-2D semiconducting van der Waals ferromagnet down to the bilayer with great potential for technological applications. Engineering the critical temperature to achieve room temperature applications is one of the critical next steps on this path. Here, we report high-resolution capacitance dilatometry studies on Cr${}_2$Ge${}_2$Te${}_6$ single crystals which directly prove significant magnetoelastic coupling and provide quantitative values of the large uniaxial pressure effects on long-range magnetic order ($\partial T_{\mathrm{C}}/\partial p_{\mathrm{c}}$ = 24.7 K/GPa and $\partial T_{\mathrm{C}}/\partial p_{\mathrm{ab}}$ = $-$15.6 K/GPa) derived from thermodynamic relations. Moderate in-plane strain is thus sufficient to strongly enhance ferromagnetism in Cr${}_2$Ge${}_2$Te${}_6$ up to room temperature. Moreover, unambiguous signs for short-range magnetic order up to 200~K are found.

Main text: 8 pages, 4 figures; update of numerical values

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• Observation of enhanced spin-spin correlations at triple point in 2D ferromagnetic Cr2X2Te6 (X=Si, Ge)
• Sizable suppression of magnon Hall effect by magnon damping in Cr${}_2$Ge${}_2$Te${}_6$
• Strong uniaxial pressure dependencies evidencing spin-lattice coupling and spin fluctuations in Cr${}_2$Ge${}_2$Te${}_6$
• Fluctuating Fractionalized Spins in Quasi Two-dimensional Magnetic V0.85PS3
• Exchange striction induced thermal Hall effect in van der Waals antiferromagnet MnPS${}_3$
• Near room-temperature ferromagnetism from double-exchange in the van der Waals material CrGeTe${}_3$: evidence from optical conductivity under pressure
• Critical behavior and evidence of dimensional crossover in quasi-two-dimensional Li${}_2$FeSiO${}_4$