Nearly room temperature ferromagnetism in pressure-induced correlated metallic state of van der Waals insulator CrGeTe${}_3$

Abstract

A complex interplay of different energy scales involving Coulomb repulsion, spin-orbit coupling and Hund's coupling energy in two-dimensional (2D) van der Waals (vdW) material produces novel emerging physical state. For instance, ferromagnetism in vdW charge transfer insulator CrGeTe${}_3$, that provides a promising platform to simultaneously manipulate the magnetic and electrical properties for potential device implementation using few layers thick materials. Here, we show a continuous tuning of magnetic and electrical properties of CrGeTe${}_3$ single crystal using pressure. With application of pressure, CrGeTe${}_3$ transforms from a FM insulator with Curie temperature, $T_{\mathrm{C}}\sim$ 66 K at ambient condition to a correlated 2D Fermi metal with $T_{\mathrm{C}}$ exceeding $\sim$ 250 K. Notably, absence of an accompanying structural distortion across the insulator-metal transition (IMT) suggests that the pressure induced modification of electronic ground states are driven by electronic correlation furnishing a rare example of bandwidth-controlled IMT in a vdW material.

6 pages, 4 figures

References in corpus (8)

• Direct photoluminescence probing of ferromagnetism in monolayer two-dimensional CrBr3
• Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides
• Possible Kitaev Quantum Spin Liquid State in 2D Materials with S=3/2
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• Electronic structure and magnetic properties of pyroxenes (Li,Na)TM(Si,Ge)2O6: novel low-dimensional magnets with 90 bonds
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Cited by in corpus (10)

• Pervasive beyond room-temperature ferromagnetism in a doped van der Waals magnet: Ni doped Fe${}_5$GeTe${}_2$ with $T_{\text{C}}$ up to 478 K
• Pressure-enhanced ferromagnetism in layered CrSiTe3 flakes
• Strong effects of uniaxial pressure and short-range correlations in Cr2Ge2Te6
• Pressure evolution of electronic structure and magnetism in the layered van der Waals ferromagnet CrGeTe${}_3$
• Strong uniaxial pressure dependencies evidencing spin-lattice coupling and spin fluctuations in Cr${}_2$Ge${}_2$Te${}_6$
• Optical Switching of Moiré Chern Ferromagnet
• Pressure tuning of intrinsic and extrinsic sources to the anomalous Hall effect in CrGeTe${}_3$
• Near room-temperature ferromagnetism from double-exchange in the van der Waals material CrGeTe${}_3$: evidence from optical conductivity under pressure
• Exciton-spin interactions in antiferromagnetic charge-transfer insulators
• Phonon frequency comb close to an isolated Einstein mode in InSiTe3