Spin Reorientation Transition and Negative Magnetoresistance in Ferromagnetic NdCrSb3 Single Crystals

Chen, Lei; Zhao, Weiyao; Wang, Zhaocai; Tang, Fang; Fang, Yong; Zeng, Zhi; Xia, Zhengcai; Cheng, Zhenxiang; Cortie, David; Rule, K. C.; Wang, Xiaolin; Zheng, Ren‐Kui

doi:10.3390/ma16041736

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…More recently, it has been reported that F4GT exhibits a change in easy axis of magnetization when cooled below ∼ 110 K termed as the 'spin reorientation transition' (SRT) [20,21], making it magnetically quite different from the other two family members. A similar spin reorientation transition was observed in materials like Fe 3 Sn 2 [32][33][34][35], Nd 2 Fe 14 B [36], TbMn 6 Sn 6 [37][38][39][40], LiMn 6 Sn 6 [41], NdCrSb 3 [42], La 0.4 Sm 0.3 Sr 0.3 MnO 3 [43] etc. The interplay between magnetic exchange and effective magnetic anisotropy is possibly the reason for this spin reorientation [20,22,44].…”

Section: Introductionsupporting

confidence: 72%

Spin-reorientation driven emergent phases and unconventional magnetotransport in quasi-2D vdW ferromagnet Fe4GeTe2

Pal,

Pal

et al. 2023

Preprint

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Nontrivial spin textures driven by strong exchange interaction, magneto-crystalline anisotropy and electron correlation in a low-dimensional magnetic material often lead to unusual electronic transitions. Through a combination of transport experiments and first principle calculations, we unravel the new electronic phases in quasi-2D van der Waals ferromagnet, Fe4GeTe2, possessing ferromagnetic TC ∼ 270 K, along with a spin reorientation transition (TSR ∼ 120 K) with the change of magnetic easy axis. Two electronic transitions are identified. The first transition near TSR exhibits a sharp fall in resistivity, followed by a sign change in the ordinary Hall coefficient (RH), together with, maximum negative magnetoresistance (MR) and anomalous Hall conductivity. Another unusual electronic transition, hitherto unknown, is observed near ∼ 38 K (TQ), where RH further changes sign and below which, the resistivity shows a quadratic temperature dependence and MR becomes positive. An analysis of the experimental data further uncovers the role of competing inelastic scattering processes in anomalous magnetotransport behavior. A DFT-based first-principle calculations unveil two possible magnetic phases, followed by a low-energy model Hamiltonian which captures the essence of these phases as well as explains the observed magnetotransport behavior. Thus, we demonstrate an interplay between magnetism and band topology and its consequence on electron transport in Fe4GeTe2, important for spintronic applications.

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Section: Introductionsupporting

confidence: 72%

Spin-reorientation driven emergent phases and unconventional magnetotransport in quasi-2D vdW ferromagnet Fe4GeTe2

Pal,

Pal

et al. 2023

Preprint

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“…In this case, the crystal is probably reaching the ordering transition point, and thus is easily affected by the applied magnetic field. This magnetic field-induced ordering will reduce the magnetic disorder-induced scatterings and thus contribute to a negative MR. A significant negative MR is usually observed slightly above the magnetic ordered phase as an indication of short-range ordering, e.g., in Ti-doped Cr 2 Se 3 [73], NdCrSb 3 [76]. In CoTe 2-δ single crystals, the negative MR behavior is probably due to the short-range magnetic interactions, in which the moments will be aligned along the magnetic field.…”

Section: Resultsmentioning

confidence: 99%

Single Crystal Growth and Nano-Structure Study in a Topological Dirac Metal, CoTe2-δ

Chen,

Zhao,

Zheng

2023

Crystals

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A single crystal of a topological material, CoTe2-δ, has been grown via the chemical vapor transport method for a structural and electronic transport study. Single-crystal X-ray diffraction, powder X-ray diffraction, and high-resolution scanning electron microscope measurements confirm the high quality of the as-grown single crystals. In a high-resolution scanning electron microscopy study, a clear layered feature of the trigonal CoTe2-δ crystal was observed. Fractal features and mosaic-type nanostructures were observed on the as-grown surface and cleaved surface, respectively. The trigonal CoTe2-δ demonstrates a metallic ground state in transport measurements, with a typical carrier’s concentration in a 1021 cm−3 magnitude and a residual resistivity ratio of 1.6. Below 10 K, trigonal CoTe2-δ contains quite complicated magnetoresistance behavior as a result of the competing effect between Dirac states and possible spin fluctuations.

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Spin-reorientation driven emergent phases and unconventional magnetotransport in quasi-2D vdW ferromagnet Fe4GeTe2

Pal,

Mondal

et al. 2024

npj 2D Mater Appl

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Non-trivial spin textures driven by strong exchange interaction, magneto-crystalline anisotropy, and electron correlation in a low-dimensional magnetic material often lead to unusual electronic transitions. Through a combination of transport experiments in exfoliated nanoflakes down to 16 layers and first principle calculations, we unravel emergent electronic phases in quasi-2D van der Waals ferromagnet, Fe4GeTe2, possessing ferromagnetic TC ~ 270 K, along with a spin-reorientation transition (TSR ~ 120 K) with the change of magnetic easy axis. Two electronic transitions are identified. The first transition near TSR exhibits a sharp fall in resistivity, followed by a sign change in the ordinary Hall coefficient (R0), together with, maximum negative magnetoresistance (MR) and anomalous Hall conductivity. Another unusual electronic transition, hitherto unknown, is observed near ~ 40–50 K (TQ), where R0 again changes sign and below which, the resistivity shows a quadratic temperature dependence, and MR becomes positive. An analysis of the experimental data further uncovers the role of competing inelastic scattering processes in anomalous magnetotransport behavior. The density-functional theory based first-principle calculations unveil two possible magnetic phases, followed by a low-energy model Hamiltonian which captures the essence of these phases as well as explains the observed magnetotransport behavior. Thus, we demonstrate an interplay between magnetism and band topology and its consequence on electron transport in Fe4GeTe2, important for spintronic applications.

show abstract

Spin Reorientation Transition and Negative Magnetoresistance in Ferromagnetic NdCrSb3 Single Crystals

Cited by 3 publications

References 17 publications

Spin-reorientation driven emergent phases and unconventional magnetotransport in quasi-2D vdW ferromagnet Fe4GeTe2

Spin-reorientation driven emergent phases and unconventional magnetotransport in quasi-2D vdW ferromagnet Fe4GeTe2

Single Crystal Growth and Nano-Structure Study in a Topological Dirac Metal, CoTe2-δ

Spin-reorientation driven emergent phases and unconventional magnetotransport in quasi-2D vdW ferromagnet Fe4GeTe2

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