Critical behavior and magnetocaloric effect of the quasi-two-dimensional room-temperature ferromagnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Cr</mml:mi><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub><mml:mi>Te</mml:mi><mml:msub><mml:mrow /><mml:mn>5</mml:mn></mml:msub></mml:math>

Zhang, Luo-Zhao; Zhang, An-Lei; He, Xiu-De; Ben, Xin-Wei; Xiao, Qi-Ling; Lü, Weijia; Chen, Fei; Feng, Zhenjie; Cao, Shixun; Zhang, Jincang; Ge, Jun‐Yi

doi:10.1103/physrevb.101.214413

Cited by 40 publications

(34 citation statements)

References 53 publications

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“…To explore the magnetic properties of Cr 4 Te 5 , magnetization as a function of temperature M(T) and field M(H) were measured with the field applied parallel to ab-plane (H ab) and c-axis (H c). The Curie temperature 338 K found in this study is higher than any known composition in the Cr x Te y family in their bulk phase [25,36]. Splitting in the M(T) curves between ZFC and FC data at T C is attributed to the competition between FM and AFM phases at low temperatures [37,38].…”

Section: A Magnetization Measurementscontrasting

confidence: 44%

“…A Recent theoretical study suggested that the layered Cr x Te y systems are potential candidates to realize the muchanticipated room-temperature 2D ferromagnetism in the bulk [21]. Since then, variety of Cr x Te y compounds have been grown experimentally and studied for their peculiar 2D ferromagnetism, including, CrTe [22], Cr 2 Te 3 [23], Cr 3 Te 4 [24], Cr 4 Te 5 [25], and Cr 5 Te 8 [26]. Out of these, Cr 4 Te 5 has been reported to show highest T C ≈ 318 K among this family of compounds, to date in the bulk form.…”

Section: Introductionmentioning

confidence: 99%

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Magnetocrystalline Anisotropy and Magnetocaloric Effect Studies on the Room-temperature 2D Ferromagnetic Cr$_4$Te$_5$

Purwar¹,

Changdar²,

Ghosh³

et al. 2022

Preprint

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We present a thorough study on the magnetoanisotropic properties and magnetocaloric effect in the layered ferromagnetic Cr 4 Te 5 single crystals by performing the critical behaviour analysis of magnetization isotherms. The critical exponents β =0.485(3), γ=1.202(5), and δ =3.52(3) with a Curie temperature of T C ≈ 340.73(4) K are determined by the modified Arrott plots. We observe a large magnetocrystalline anisotropy K u =330 kJ/m 3 at 3 K which gradually decreases with increasing temperature. Maximum entropy change -∆S max M and the relative cooling power (RCP) are found to be 2.77 J/kg -K and 88.29 J/kg, respectively near T C when the magnetic field applied parallel to ab-plane. Rescaled -∆S M (T, H) data measured at various temperatures and fields collapse into a single universal curve, confirming the second order magnetic transition in this system. Following the renormalization group theory analysis, we find that the spin-coupling is of 3D Heisenberg-type, {d : n} = {3 : 3}, with long-range exchange interactions decaying as J(r) = r -(d+σ ) = r -4.71 .

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Section: A Magnetization Measurementscontrasting

confidence: 44%

Section: Introductionmentioning

confidence: 99%

Magnetocrystalline Anisotropy and Magnetocaloric Effect Studies on the Room-temperature 2D Ferromagnetic Cr$_4$Te$_5$

Purwar¹,

Changdar²,

Ghosh³

et al. 2022

Preprint

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“…Prominent among magnetic TMDs is Cr1+δTe2 -a self-intercalated TMD with tunable valency (Cr 2+ (3d 4 ) to Cr 4+ (3d 2 )) -which therefore serves as a promising candidate for modulating electronic and magnetic properties over a wide range (Fig. 1a) [37,38,39,40,41,42,43,44,45,46,47,48,49,50,51]. Our recent efforts have enabled a unique recipe to realize epitaxial thin films of Cr1+δTe2 over wide range of doping, with tunable magnetic properties [52].…”

Section: A Introductionmentioning

confidence: 99%

Widely Tunable Berry curvature in the Magnetic Semimetal Cr1+dTe2

Fujisawa¹,

Pardo-Almanza²,

Hsu³

et al. 2022

Preprint

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Magnetic semimetals have increasingly emerged as lucrative platforms hosting spin-based topological phenomena in real- and momentum spaces. Of particular interest is the emergence of Berry curvature, whose geometric origin, accessibility from Hall transport experiments, and material tunability, bodes well for new physics and practical devices. Cr1+δTe2, a self-intercalated magnetic transition metal dichalcogenide (TMD), exhibits attractive natural attributes relevant to such applications, including topological magnetism, tunable electron filling, magnetic frustration etc. While recent studies have explored real-space Berry curvature effects in this material, similar considerations of momentum-space Berry curvature are lacking. Here, we systematically investigate the electronic structure and transport properties of epitaxial Cr1+δTe2 thin films over a wide range of doping, δ (0.33 – 0.71). Spectroscopic experiments reveal the presence of a characteristic semi-metallic band region near the Brillouin Zone edge, which shows a rigid band like energy shift as a function of δ. Transport experiments show that the intrinsic component of the anomalous Hall effect (AHE) is sizable, and undergoes a sign flip across δ. Finally, density functional theory calculations establish a causal link between the observed doping evolution of the band structure and AHE: the AHE sign flip is shown to emerge from the sign change of the Berry curvature, as the semi-metallic band region crosses the Fermi energy. Our findings underscore the increasing relevance of momentum-space Berry curvature in magnetic TMDs and provide a unique platform for intertwining topological physics in real and momentum spaces.

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“…The chemical content of the as-synthesized Cr 1.2 Te 2 was quantified to be a mole ratio of 1.2:2 by inductively coupled plasma-atomic emission spectrometry (Table S2, Supporting Information). X-ray diffraction characterization (Figure d) reveals that the as-synthesized Cr 1.2 Te 2 has the same crystal structure as CrTe 2 , containing the space group P 3̅ m 1 and exhibiting a crystal structure distinguished from other reported telluride compounds (Figure S1, Supporting Information) such as Cr 2 Te 3 , Cr 3 Te 4 , Cr 3 Te 5 , Cr 4 Te 5 , and Cr 5 Te 8 . − The high-resolution scanning transmission electron microscopy (HRSTEM) image of the as-synthesized Cr 1.2 Te 2 (Figure e) and its corresponding simulation (Figure f) further confirm that the crystal structure duplicates that of the reported CrTe 2 …”

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confidence: 99%

Possible Topological Hall Effect above Room Temperature in Layered Cr_1.2Te₂ Ferromagnet

et al. 2021

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Topological Hall effect (THE) has been used as a powerful tool to unlock spin chirality in novel magnetic materials. Recent focus has been widely paid to THE and possible chiral spin textures in two-dimensional (2D) layered magnetic materials. However, the room-temperature THE has been barely reported in 2D materials, which hinders its practical applications in 2D spintronics. In this paper, we report a possible THE signal featuring antisymmetric peaks in a wide temperature window up to 320 K in Cr 1.2 Te 2 , a new quasi-2D ferromagnetic material. The temperature, thickness, and magnetic field dependences of the THE lead to potential spin chirality origin that is associated with the spin canting under external magnetic fields. Our work holds promise for practical applications in future chiral spin-based vdW spintronic devices.

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Critical behavior and magnetocaloric effect of the quasi-two-dimensional room-temperature ferromagnet Cr4Te5

Cited by 40 publications

References 53 publications

Magnetocrystalline Anisotropy and Magnetocaloric Effect Studies on the Room-temperature 2D Ferromagnetic Cr$_4$Te$_5$

Magnetocrystalline Anisotropy and Magnetocaloric Effect Studies on the Room-temperature 2D Ferromagnetic Cr$_4$Te$_5$

Widely Tunable Berry curvature in the Magnetic Semimetal Cr1+dTe2

Possible Topological Hall Effect above Room Temperature in Layered Cr_1.2Te₂ Ferromagnet

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Critical behavior and magnetocaloric effect of the quasi-two-dimensional room-temperature ferromagnet Cr4Te5

Cited by 40 publications

References 53 publications

Magnetocrystalline Anisotropy and Magnetocaloric Effect Studies on the Room-temperature 2D Ferromagnetic Cr$_4$Te$_5$

Magnetocrystalline Anisotropy and Magnetocaloric Effect Studies on the Room-temperature 2D Ferromagnetic Cr$_4$Te$_5$

Widely Tunable Berry curvature in the Magnetic Semimetal Cr1+dTe2

Possible Topological Hall Effect above Room Temperature in Layered Cr1.2Te2 Ferromagnet

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Possible Topological Hall Effect above Room Temperature in Layered Cr_1.2Te₂ Ferromagnet