SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Focus Session: Correlated van-der-Waals Magnets

TT 4.6: Vortrag

Montag, 27. September 2021, 15:30–15:45, H7

Magnetoelastic coupling in the ferromagnetic van-der-Waals material CrI₃ — •Jan Arneth¹, Martin Jonak¹, Sven Spachmann¹, Mahmoud Abdel-Hafiez², Yaroslav Kvashnin³, and Rüdiger Klingeler¹ — ¹Kirchhoff Institute of Physics, Heidelberg University, Germany — ²Department of Physics and Astronomy, X-ray Photon Science, Uppsala University, Sweden — ³Department of Physics and Astronomy, Materials Theory, Uppsala University, Sweden

We present high-resolution thermal expansion and magnetostriction studies on the layered van-der-Waals (vdW) ferromagnet CrI₃ in magnetic fields up to 15 T. Distinct anomalies in the thermal expansion coefficient at the ferromagnetic ordering temperature signal magnetoelastic coupling and allow us to quantify the uniaxial pressure dependencies ∂ T_C/∂ p_i. While T_C reduces at a rate of −0.4 K/GPa upon the application of in-plane pressure, ferromagnetism is stabilized and the effect is about 4 times larger for out-of-plane pressure. The results are compared with numerical studies. We also observe macroscopic length changes associated with field-induced flipping of antiferromagnetically coupled surface layers in the magnetostriction data. We construct the magnetic phase diagram of bulk CrI₃ and show that magnetostriction is also sensitive to the saturation fields of the FM bulk and AFM surface phases.