Pressure-induced superconductivity and structural transition in ferromagnetic Cr2Si2Te6

Abstract

The discovery of intrinsic magnetism in atomically thin two-dimensional transition-metal trichalcogenides has attracted intense research interest due to the exotic properties of magnetism and potential applications in devices. Pressure has proven to be an effective tool to manipulate the crystal and electronic structures of the materials. Here, we report investigations on ferromagnetic van der Waals Cr2Si2Te6 via high-pressure synchrotron x-ray diffraction, electrical resistance, Hall resistance, and magnetoresistance measurements. Under compression, Cr2Si2Te6 simultaneously undergoes a structural transition, emergence of superconductivity at 3 K, sign change of the magnetoresistance, and dramatic change of the Hall coefficient at ~8 GPa. The superconductivity persists up to the highest measured pressure of 47.1 GPa with a maximum Tc = 4.5 K at ~30 GPa. The discovery of superconductivity in the two-dimensional van der Waals ferromagnetic Cr-based Cr2Si2Te6 provides new perspectives to explore superconductivity and the interplay between superconductivity and magnetism.

13 pages, 4 figures in the main article and 5 figures in the supplementary file

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• Evidence for charge and spin order in single crystals of La${}_3$Ni${}_2$O${}_7$ and La${}_3$Ni${}_2$O${}_6$
• Nearly room temperature ferromagnetism in pressure-induced correlated metallic state of van der Waals insulator CrGeTe${}_3$
• Pressure-enhanced ferromagnetism in layered CrSiTe3 flakes
• Effects of Fe deficiency and Co substitution in polycrystalline and single crystals of Fe${}_3$GeTe${}_2$
• Superconductivity arising from pressure induced Lifshitz transition in Rb${}_2$Pd${}_3$Se${}_4$ with kagome lattice
• Short-range Crystalline Order-Tuned Conductivity in Cr${}_2$Si${}_2$Te${}_6$ van der Waals Magnetic Crystals
• Pressure evolution of electronic structure and magnetism in the layered van der Waals ferromagnet CrGeTe${}_3$
• Topological superconductivity from doping a triplet quantum spin liquid in a flat band system
• Mapping AC Susceptibility with Quantum Diamond Microscope
• Crystal and electronic structure of a quasi-two-dimensional semiconductor Mg${}_3$Si${}_2$Te${}_6$
• Triplet-odd pairing in finite nuclear systems: Even-even singly closed nuclei
• Gap and magnetic engineering via doping and pressure in tuning the colossal magnetoresistance in (Mn${}_{1-x}$Mg${}_x$)${}_3$Si${}_2$Te${}_6$
• Near room-temperature ferromagnetism from double-exchange in the van der Waals material CrGeTe${}_3$: evidence from optical conductivity under pressure
• Magnetic anisotropy and critical behavior of the quaternary van der Waals ferromagnetic material $\mathbf{CrG}{\mathbf{e}}_{\delta }\mathbf{S}{\mathbf{i}}_{1-\delta }\mathbf{T}{\mathbf{e}}_3$
• Single crystal growth and superconductivity in RbNi${}_2$Se${}_2$
• Triplet resonating valence bond theory and transition metal chalcogenides
• Superconductivity in the pressure-amorphized topological insulator CrP${}_4$
• Connection between the semiconductor--superconductor transition and the spin-polarized superconducting phase in the honeycomb lattice