Observation of enhanced spin-spin correlations at triple point in 2D ferromagnetic Cr2X2Te6 (X=Si, Ge)

Abstract

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.

17 pages, 6 figures, submitted to PRL

References in corpus (6)

• Tricritical behavior of two-dimensional intrinsic ferromagnetic semiconducting CrGeTe3
• Critical behavior of quasi-two-dimensional semiconducting ferromagnet CrGeTe${}_3$
• Dimensional crossover in a layered ferromagnet detected by spin correlation driven distortions
• Strong effects of uniaxial pressure and short-range correlations in Cr2Ge2Te6
• Angle dependent field-driven reorientation transitions in uniaxial antiferromagnet MnBi${}_2$Te${}_4$ single crystal
• Tricritical fluctuations and elastic properties of the Ising antiferromagnet UIrSi${}_3$

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• Impact of Thermal Effects on the Current-Tunable Electrical Transport in the Ferrimagnetic Semiconductor Mn${}_3$Si${}_2$Te${}_6$
• Quasi-two-dimensional ferromagnetism in the triangular magnet EuAl${}_{12}$O${}_{19}$
• Magnetoelastic coupling at the field-induced transition in EuAl${}_{12}$O${}_{19}$