Clarifying how twins affect magnetic and electrical properties of van der Waals (vdW) magnets is of significance in taking and tailoring the functional performance. Here, detailed magnetic measurements and electrical transport were performed in twinned FePd2Te2 . Intense magnetic domain motion is evidenced by the Hopkinson effect observed in magnetic susceptibility. Antiferromagnetic coupling component near twin boundary gives a rise to a set of abnormal critical exponents β = 0.87(1), γ = 1.03(8), δ = 2.19(9) and four-fold symmetric in-plane anisotropic magnetoresistance (AMR). The critical exponents cannot be classified as a standard universality class, and suggest the long-range mean-field like magnetism and decoupling of dimensionality between the isotropic magnetism and quasi-1D Fe chains as functional motif. Electrical transport in detwinned FePd2Te2 evidences the decisive role of twin boundary in higher-order symmetry of the in-plane AMR and reveals a large in-plane resistivity anisotropy as high as ∼ 6.3. The strong temperature dependence of the electrical anisotropy indicates a possible electronic nematicity. These results reveal intriguing interplay among magnetism, electrical transport and twin domain in vdW magnets.
CHEN et al. (Sun,) studied this question.
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