Uniaxial pressure effects in the two-dimensional van-der-Waals ferromagnet CrI${}_3$

Abstract

Magnetoelastic coupling and uniaxial pressure dependencies of the ferromagnetic ordering temperature in the quasi-two-dimensional layered van-der-Waals material CrI${}_3$ are experimentally studied and quantified by high-resolution dilatometry. Clear anomalies in the thermal expansion coefficients at $T_{\mathrm{C}}$ imply positive (negative) pressure dependencies $\partial T_{\mathrm{C}}/\partial p_{\mathrm{i}}$ for pressure applied along (perpendicular to) the $c$ axis. The experimental results are backed up by numerical studies showing that the dominant, intra-layer magnetic coupling increases upon compression along the $c$ direction and decreases with negative in-plane strain. In contrast, inter-layer exchange is shown to initially increase and subsequently decrease upon the application of both out-of-plane and in-plane compression.

16 pages, 5 figures

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Cited by in corpus (1)

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