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Condensed Matter > Materials Science
Title: Spin-glass states generated in van der Waals magnet Cr$_2$Ge$_2$Te$_6$ by alkali-ion intercalation
(Submitted on 29 Dec 2023 (v1), last revised 25 Mar 2024 (this version, v2))
Abstract: Tuning magnetic properties in layered van der Waals (vdW) materials has captured a significant attention due to the efficient control of ground-states by heterostructuring and external stimuli. Electron doping by electrostatic gating, interfacial charge transfer and intercalation is particularly effective in manipulating the exchange and spin-orbit properties, resulting in a control of Curie temperature ($T_{\text{C}}$) and magnetic anisotropy. Here, we discover an uncharted role of intercalation to generate magnetic frustration. As a model study, we intercalate Na atoms into the vdW gaps of pristine Cr$_2$Ge$_2$Te$_6$ (CGT) where generated magnetic frustration leads to emerging spin-glass states coexisting with a ferromagnetic order. A series of dynamic magnetic susceptibility measurements/analysis confirms the formation of magnetic clusters representing slow dynamics with a distribution of relaxation times. The intercalation also modifies other macroscopic physical parameters including the significant enhancement of $T_{\text{C}}$ from 66K\, to 240\,K and the switching of magnetic easy-hard axis direction. Our study identifies intercalation as a unique route to generate emerging frustrated spin states in simple vdW crystals.
Submission history
From: Aakanksha Sud Ms [view email][v1] Fri, 29 Dec 2023 10:59:43 GMT (7335kb,D)
[v2] Mon, 25 Mar 2024 03:57:04 GMT (7347kb,D)
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