A Study of the Chromous—Chromic Iodide Equilibrium

Handy, L.L.; Gregory, N. W.

doi:10.1021/ja01167a063

Cited by 21 publications

(19 citation statements)

References 1 publication

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“…[12][13][14] Bulk VI 3 is an insulating 2D ferromagnet with T c = 55 K and crystallizes in a layered structure. [15][16][17] Each V ion is centered in an octahedron of I ions, form a honeycomb lattice within the ab plane [inset in Fig. 1(a)], similar with CrI 3 .…”

Section: Introductionmentioning

confidence: 99%

Critical behavior and magnetocaloric effect in VI3

Liu

Abeykoon

Petrović

2020

Phys. Rev. Research

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Layered van der Waals ferromagnets are promising candidates for designing new spintronic devices. Here we investigated the critical properties and magnetocaloric effect connected with ferromagnetic transition in layered van der Waals VI3 single crystals. The critical exponents β = 0.244(5) with a critical temperature Tc = 50.10(2) K and γ = 1.028(12) with Tc = 49.97(5) K are obtained from the modified Arrott plot, whereas δ = 5.24(2) is obtained from a critical isotherm analysis at Tc = 50 K. The magnetic entropy change −∆SM (T, H) features a maximum at Tc, i.e., −∆S max M ∼ 2.64 (2.27) J kg −1 K −1 with out-of-plane (in-plane) field change of 5 T. This is consistent with −∆S max M ∼ 2.80 J kg −1 K −1 deduced from heat capacity and the corresponding adiabatic temperature change ∆T ad ∼ 0.96 K with out-of-plane field change of 5 T. The critical analysis suggests that the ferromagnetic phase transition in VI3 is situated close to a three-to two-dimensional critical point. The rescaled ∆SM (T, H) curves collapse onto a universal curve, confirming a second-order type of the magnetic transition and reliability of the obtained critical exponents.

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Section: Introductionmentioning

confidence: 99%

Critical behavior and magnetocaloric effect in VI3

Liu

Abeykoon

Petrović

2020

Phys. Rev. Research

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“…CrI 3 and VI 3 belong to a wider family of MX 3 transition metal trihalides, with X = Cl, Br, I, which were synthesized in the 60s 13,14 but have since seen little interest until recently 15 . VI 3 is an insulating two-dimensional ferromagnet with a Curie Temperature, T c , given as 55 K and reported to have the layered crystal structure of BiI 3 with space group R-3 [16][17][18] . As shown in a recent review 15 , there is very little available information on VI 3 other than the structure and the expected S = 1 from the 3d 2 configuration of the vanadium sites.…”

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confidence: 99%

Bulk properties of the van der Waals hard ferromagnet VI3

et al. 2019

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We present comprehensive measurements of the structural, magnetic and electronic properties of layered van-der-Waals ferromagnet VI3 down to low temperatures. Despite belonging to a wellstudied family of transition metal trihalides, this material has received very little attention. We outline, from high-resolution powder x-ray diffraction measurements, a corrected room-temperature crystal structure to that previously proposed and uncover a structural transition at 79 K, also seen in the heat capacity. Magnetization measurements confirm VI3 to be a hard ferromagnet (9.1 kOe coercive field at 2 K) with a high degree of anisotropy, and the pressure dependence of the magnetic properties provide evidence for the two-dimensional nature of the magnetic order. Optical and electrical transport measurements show this material to be an insulator with an optical band gap of 0.67 eV -the previous theoretical predictions of d-band metallicity then lead us to believe VI3 to be a correlated Mott insulator. Our latest band structure calculations support this picture and show good agreement with the experimental data. We suggest VI3 to host great potential in the thriving field of low-dimensional magnetism and functional materials, together with opportunities to study and make use of low-dimensional Mott physics.Two-dimensional van-der-Waals (vdW) magnetic materials have in recent years become the subject of a wide range of intense research 1 . While a large portion of research into two-dimensional materials has centered on graphene, the addition of magnetism into such a system leads to many interesting fundamental questions and opportunities for device applications 2-6 . Particularly for future spintronics applications, semiconducting or metallic materials which exhibit ferromagnetism down to monolayer thickness are an essential ingredient. This has led to a large volume of recent publications on two-dimensional honeycomb ferromagnet CrI 3 7-12 . CrI 3 and VI 3 belong to a wider family of MX 3 transition metal trihalides, with X = Cl, Br, I, which were synthesized in the 60s 13,14 but have since seen little interest until recently 15 . VI 3 is an insulating two-dimensional ferromagnet with a Curie Temperature, T c , given as 55 K and reported to have the layered crystal structure of BiI 3 with space group R-3 [16][17][18] . As shown in a recent review 15 , there is very little available information on VI 3 other than the structure and the expected S = 1 from the 3d 2 configuration of the vanadium sites. Calculations using density functional theory, which additionally yield the exchange constants, have suggested VI 3 to not only remain ferromagnetic down to a single crystalline layer, but to also exhibit Dirac half-metallicity, of interest for spintronic applications 19 .In these vdW materials, hydrostatic pressure forms an extremely powerful tuning parameter. Given the weak mechanical forces between the crystal planes, the application of pressure will dominantly have the effect of pressing the ab planes together, and gradually an...

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“…From the practical viewpoint of experimentalists, the nature of the VI3 single crystals and some related di-and trihalides (CrI3 [17,18], Ti-and ZrX2 [19]) reveals a substantial disadvantagethey are metastable at ambient conditions, complicating or even making an impossible number of measurements. The instability of MX2 (M = Cu, Ag) dihalides was studied using the ionicinteraction approach to crystal formation [20], showing that a high ionization potential of the divalent transition metal M 2+ in combination with large polarizability α of the anion halide (increasing from αF ~ 1 Å 3 over αCl and αBr to αI ~ 7.5 Å 3 ; see [20] and references therein) can explain the non-existence or metastability of some MX2.…”

Section: Introductionmentioning

confidence: 99%