Correlations of crystallographic defects and anisotropy with magnetotransport properties in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>TaS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>single crystals (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>0.23</mml:mn><mml:mo>≤</mml:mo><mml:mi>x</mml:mi><mml:mo>≤</mml:mo><mml:mn>0.35</mml:mn></mml:mrow></mml:math>)

Chen, Chih‐Wei; Saito, Chikara; Zapf, V. S.; Morosan, Emilia

doi:10.1103/physrevb.94.054406

Cited by 37 publications

(101 citation statements)

References 25 publications

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“…3), similar to the M(H) behavior in 2H-Fe x TaS 2 ( Fig. 4 in Chen et al 27 ). Sharp hysteresis loops were first observed in 2H-Fe 1/4 TaS 2 25 .…”

Section: Resultssupporting

confidence: 81%

“…Sharp hysteresis loops were first observed in 2H-Fe 1/4 TaS 2 25 . As a function of x, the switching field H s decreased for 0.25 < x < 0.35 27 . The similarities between the sharp hysteresis loops in both T = Ta and Ti series motivated MR measurements on 1T-Fe x TiS 2 , since very large MR values (up to ∼ 140%) were discovered in 2H-Fe x TaS 2 26 .…”

Section: Resultsmentioning

confidence: 98%

“…For x = 1/4, the magnetization shows sharp switching, resulting in rectangular isothermal magnetization curves 25 . Fe concentrations away from x = 1/4 reveal an increase in MR, from < 1% at the x = 1/4 superstructure to ∼ 140% at x = 0.29, attributed to spin disorder scattering 26,27 .…”

Section: H-fementioning

confidence: 98%

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Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

et al. 2019

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Sharp magnetization switching and large magnetoresistance (MR) were previously discovered in single crystals of 2H-FexTaS2 and attributed to the Fe superstructure and its defects. We report similar sharp switching and large MR in 1T-FexTiS2 (0.086 ≤ x ≤0.703), while providing a side by side comparison of the only two such ferromagnetic transition metal dichalcogenides. The switching field Hs and MR values are similar in both 1T-FexTiS2 and 2H-FexTaS2, with a larger than expected bowtie ρ(H) and a sharper hysteresis loop for H c in the former. The Curie and Weiss temperatures remain roughly constant below x ∼ 1/3 in the T = Ti single crystals, before monotonically increasing for higher x, while Hs and MR reach maxima where defects in the superstructure exist, or a minimum near superstructures compositions, and remain constant above x ∼ 0.4. Despite previous reports, electron diffraction shows only the √ 3× √ 3 superstructure in 1T-FexTiS2. Glassy behavior is shown to coexist within the ferromagnetic state in 1T-FexTiS2 for compositions between 0.1 and 0.703. A simple theoretical model considering first-, second-and third-neighbor interactions yields a phase diagram which accounts for both spin glass behavior and for different superstructures.

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“…3), similar to the M(H) behavior in 2H-Fe x TaS 2 ( Fig. 4 in Chen et al 27 ). Sharp hysteresis loops were first observed in 2H-Fe 1/4 TaS 2 25 .…”

Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 98%

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Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

et al. 2019

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“…Interestingly, Bc is only ≈ 0.04 T at T = 10 K for this 14-nm Fe0.29TaS2 device ( Fig. 2(a)), which is significantly small compared to Bc of the bulk FexTaS2 [21][22][23][24]. To investigate the underlying mechanism for the variation of Bc, we perform the AHE measurements on the devices fabricated on Fe0.29TaS2 thin flakes with thickness from 14 nm to bulk single crystal.…”

Section: Figures 1(c-d) Show the Hall Resistances (Rxy) Vs The Perpementioning

confidence: 99%

“…Figure 1(a) shows the crystalline structure of the layered Fe-intercalated van der Waals ferromagnet FexTaS2, where the Fe atoms are located between the two TaS2 layers. These layers are stacked together via van der Waals interaction with an interlayer distance of ≈ 6 Å. FexTaS2 single crystals are synthesized using the iodine vapor transport method, as described in previous reports [16,[21][22][23][24]. The concentration of Fe (x) in synthesized FexTaS2 single crystals is determined to be 0.29 by energy-dispersive spectroscopy ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Hall effect mechanisms in the quasi-two-dimensional van der Waals ferromagnet Fe0.29TaS2

et al. 2019

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The recent emergence of two-dimensional (2D) van der Waals ferromagnets has provided a new platform for exploring magnetism in the flatland and for designing 2D ferromagnet-based spintronics devices. Despite intensive studies, the anomalous Hall effect (AHE) mechanisms in 2D van der Waals ferromagnets have not been investigated yet. In this paper, we report the AHE mechanisms in quasi-2D van der Waals ferromagnet Fe0.29TaS2 via systematically measuring Fe0.29TaS2 devices with thickness from 14 nm to bulk single crystal. The AHE mechanisms are investigated via the scaling relationship between the anomalous Hall and channel conductivities.As the Fe0.29TaS2 thickness decreases, the major AHE mechanism changes from extrinsic

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Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal T_d‐MoTe₂

et al. 2023

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crystals down to few layers and even monolayer. MoTe 2 is a typical member among TMDCs, hosting fascinating electronic properties, such as extremely large magnetoresistance, [6,7] the emergence of superconductivity, [8] the existence of topological Weyl nodes [9][10][11][12] and semiconducting behavior with a finite band gap. [13] Layered structure with weak interlayer coupling allows for the change of layer stacking order and subsequently gives rise to a structural polymorphism. [14][15][16] In fact, MoTe 2 appears in three kinds of structures: the trigonal prismatic coordinated 2H phase (space group P6 3 /mmc), distorted octahedral coordinated structures, including the monoclinic 1T′ (space group P2 1 /m), and the orthorhombic T d (space group Pmn2 1 ) phases. The 2H phase exhibits semiconducting behavior, while 1T′ and T d phases show semimetallic characters. [13,17,18] As shown in Figure 1a, at room temperature, distortion of in-plane bond give rise to monoclinic unit cell 1T′ phase (tilt angle of ≈93.9°). When decreasing the temperature below 250 K, the shift of layer stacking results an orthorhombic structure. [16,19] In its monoclinic 1T′ phase, monolayer MoTe 2 has been proposed to be topological insulator exhibiting quantum spin Hall effect. [3] While the T d phase demonstrates a number of unique properties, such as extremely large magnetoresistance, nontrivial superconductivity, [20][21][22] switchable ferroelectricity, giant nonlinear Hall effect, and unconventional planar spin Weyl semimetal T d -MoTe 2 has recently attracted much attention due to its intriguing electronic properties and potential applications in spintronics. Here, Fe-intercalated T d -Fe x MoTe 2 single crystals (0 < x < 0.15 ) are grown successfully. The electrical and thermoelectric transport results consistently demonstrate that the phase transition temperature T S is gradually suppressed with increasing x. Theoretical calculation suggests that the increased energy of the T d phase, enhanced transition barrier, and more occupied bands in 1T′ phase is responsible for the suppression in T S . In addition, a ρ α -lnT behavior induced by Kondo effect is observed with x ≥ 0.08, due to the coupling between conduction carriers and the local magnetic moments of intercalated Fe atoms. For T d -Fe 0.15 MoTe 2 , a spin-glass transition occurs at ≈10 K. The calculated band structure of T d -Fe 0.25 MoTe 2 shows that two flat bands exist near the Fermi level, which are mainly contributed by the d yz and d x y 2 2 − orbitals of the Fe atoms. Finally, the electronic phase diagram of T d -Fe x MoTe 2 is established for the first time. This work provides a new route to control the structural instability and explore exotic electronic states for transition-metal dichalcogenides.

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Correlations of crystallographic defects and anisotropy with magnetotransport properties inFexTaS2single crystals (0.23≤x≤0.35)

Cited by 37 publications

References 25 publications

Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

Anomalous Hall effect mechanisms in the quasi-two-dimensional van der Waals ferromagnet Fe0.29TaS2

Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal T_d‐MoTe₂

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Correlations of crystallographic defects and anisotropy with magnetotransport properties inFexTaS2single crystals (0.23≤x≤0.35)

Cited by 37 publications

References 25 publications

Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

Anomalous Hall effect mechanisms in the quasi-two-dimensional van der Waals ferromagnet Fe0.29TaS2

Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal Td‐MoTe2

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Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal T_d‐MoTe₂