Observation of enhanced spin-spin correlations at triple point in 2D ferromagnetic Cr2X2Te6 (X=Si, Ge)
arXiv (Cornell University)(2022)
摘要
The domain dynamics and spin-spin correlation of 2D ferromagnets Cr2X2Te6
(X=Si, Ge) are investigated by a composite magnetoelectric method. The magnetic
field-temperature phase diagrams for both in-plane and out-of-plane magnetic
fields disclose a triple point around TC and 1 kOe, where ferromagnetic,
paramagnetic, and spin-polarized phases coexist. The magnetoelectric signal
shows peak features at the phase boundaries and reaches the maximum at the
triple point, suggesting significant enhancement of spin-spin correlations at
this point. A comparison between two systems reveals that the spin-spin
correlations in Cr2Si2Te6 are stronger than that in Cr2Ge2Te6.
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关键词
ferromagnetic cr2x2te6,correlations,spin-spin
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