Pressure effect on the Curie temperature of CrBr3

Yoshida, Hajime; Chiba, J.; Kaneko, Tomoaki; Fujimori, Yasunobu; Abe, S.

doi:10.1016/s0921-4526(97)00207-x

Cited by 15 publications

(7 citation statements)

References 9 publications

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“…14. We find that the NN and NNN exchange in-teractions and the corresponding Curie temperature increase with strain, whereas the magnitude of 3NN interaction decrease. Yoshida et al 43 have investigated experimentally the pressure effect on the Curie temperature of CrBr 3 and found that T C decreases linearly with pressure, which agrees with our calculations. The Curie temperature can be tuned gradually with strain and 130 K can be reached in the case of CrI 3 using a 10% strain.…”

Section: Magnetic Propertiessupporting

confidence: 91%

Robust intrinsic ferromagnetism and half semiconductivity in stable two-dimensional single-layer chromium trihalides

et al. 2015

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Two-dimensional (2D) intrinsic ferromagnetic (FM) semiconductors are crucial to develop lowdimensional spintronic devices. Using density functional theory, we show that single-layer chromium trihalides (SLCTs) (CrX3,X=F, Cl, Br and I) constitute a series of stable 2D intrinsic FM semiconductors. A free-standing SLCT can be easily exfoliated from the bulk crystal, due to a low cleavage energy and a high in-plane stiffness. Electronic structure calculations using the HSE06 functional indicate that both bulk and single-layer CrX3 are half semiconductors with indirect gaps and their valence bands and conduction bands are fully spin-polarized in the same spin direction. The energy gaps and absorption edges of CrBr3 and CrI3 are found to be in the visible frequency range, which implies possible opt-electronic applications. Furthermore, SLCTs are found to possess a large magnetic moment of 3µB per formula unit and a sizable magnetic anisotropy energy. The magnetic exchange constants of SLCTs are then extracted using the Heisenberg spin Hamiltonian and the microscopic origins of the various exchange interactions are analyzed. A competition between a near 90 • FM superexchange and a direct antiferromagnetic (AFM) exchange results in a FM nearestneighbour exchange interaction. The next and third nearest-neighbour exchange interactions are found to be FM and AFM respectively and this can be understood by the angle-dependent extended Cr-X-X-Cr superexchange interaction. Moreover, the Curie temperatures of SLCTs are also predicted using Monte Carlo simulations and the values can further increase by applying a biaxial tensile strain. The unique combination of robust intrinsic ferromagnetism, half semiconductivity and large magnetic anisotropy energies renders the SLCTs as promising candidates for next-generation semiconductor spintronic applications.

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Section: Magnetic Propertiessupporting

confidence: 91%

Robust intrinsic ferromagnetism and half semiconductivity in stable two-dimensional single-layer chromium trihalides

et al. 2015

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“…The only prior pressure study, to our knowledge, on the MX 3 materials to date is the work of Yoshida et.al. 29 , which reports a continuous decrease in the value of T c with increasing pressure -the opposite effect to our observations.Characteristic ferromagnetic hysteresis loops of the magnetic moment with applied field along the c axis are shown in Fig. 3(c) for several temperatures.…”

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confidence: 99%

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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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“…Very recently, magnetic properties of Cr 2 Ge 2 Te 6 have been investigated under pressure and T C was found to decrease monotonically with pressure up to 1 GPa [33]. Also, a small but negative pressure coefficient of T C has been reported for CrBr 3 [34]. On the other hand, T C increases above a critical value of applied pressure in layered VI 3 [35].…”

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confidence: 99%

Effect of hydrostatic pressure on ferromagnetism in two-dimensional CrI3

et al. 2019

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We have investigated the magnetic properties of highly anisotropic layered ferromagnetic semiconductor CrI3 under hydrostatic pressure with magnetic field along the easy-axis of magnetization. At ambient pressure, CrI3 undergoes a second-order paramagnetic to ferromagnetic phase transition at TC =60.4 K. TC is found to increase sublinearly from 60.4 to 64.9 K as pressure increases from 0 to 1.0 GPa. With the increase in pressure, the transition becomes sharper while magnetization at low-field decreases monotonically due to the decrease in magnetocrystalline anisotropy. The weak low-field anomaly at around 48 K, resulting from the two-step magnetic ordering, also shifts toward higher temperature with increasing pressure. The observed increase in TC and the decrease in magnetization could originate from change in coupling between the layers and Cr-I-Cr bond angle with pressure.

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Pressure effect on the Curie temperature of CrBr3

Cited by 15 publications

References 9 publications

Robust intrinsic ferromagnetism and half semiconductivity in stable two-dimensional single-layer chromium trihalides

Robust intrinsic ferromagnetism and half semiconductivity in stable two-dimensional single-layer chromium trihalides

Bulk properties of the van der Waals hard ferromagnet VI3

Effect of hydrostatic pressure on ferromagnetism in two-dimensional CrI3

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