Magnetic anisotropy of single-crystalline Mn3Sn in triangular and helix-phase states

Duan, Tingyuan; Ren, Weijun; Liu, W. L.; Li, S. J.; Liu, W.; Zhang, Z. D.

doi:10.1063/1.4929447

Cited by 78 publications

(52 citation statements)

References 28 publications

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“…However, the complex glass phase of the B-type Mn 3 Sn makes it difficult to use the 2 inelastic neutron scattering technique at low temperature. Meanwhile, we note that both types are identical in terms of the crystal and magnetic structures at room temperature 9,18,20,21 , and it is also known that the phase transition at 220∼270 K in the A-type Mn 3 Sn is not accompanied by any structural transition 22 .…”

Section: Introductionmentioning

confidence: 59%

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Park¹,

Oh²,

Uhlířová³

et al. 2018

npj Quant Mater

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Mn 3 Sn has recently attracted considerable attention as a magnetic Weyl semimetal exhibiting concomitant transport anomalies at room temperature. The topology of the electronic bands, their relation to the magnetic ground state and their nonzero Berry curvature lie at the heart of the problem. The examination of the full magnetic Hamiltonian reveals otherwise hidden aspects of these unusual physical properties. Here, we report the full spin wave spectra of Mn 3 Sn measured over a wide momentum -energy range by the inelastic neutron scattering technique. Using a linear spin wave theory, we determine a suitable magnetic Hamiltonian which not only explains the experimental results but also stabilizes the low-temperature helical phase, consistent with our DFT calculations. The effect of this helical ordering on topological band structures is further examined using a tight-binding method, which confirms the elimination of Weyl points in the helical phase. Our work provides a rare example of the intimate coupling between the electronic and spin degrees of freedom for a magnetic Weyl semimetal system. 1 arXiv:1811.07549v1 [cond-mat.str-el]

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Section: Introductionmentioning

confidence: 59%

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Park¹,

Oh²,

Uhlířová³

et al. 2018

npj Quant Mater

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“…This information is essential for verifying the theoretical proposals of Weyl nodes based on band structure calculations 8 , 28 , 39 , 40 . Owing to the competition between the single-ion anisotropy and the Dzyaloshinskii–Moriya interaction, the in-plane anisotropic energy of Mn is absent up to fourth order in Mn 3 X ( X = Sn, Ge), and six-order anisotropy is necessary for selecting a unique ground-state spin structure 33 , 34 , 41 – 43 . With such small anisotropic energy, the coupling between a magnetic field and the weak FM moment takes on a key role that enables magnetic-field control of the antiferromagnetic (AFM) spin structure.…”

Section: Basic Properties Of Mn 3 X ( mentioning

confidence: 99%

Anomalous transport due to Weyl fermions in the chiral antiferromagnets Mn3X, X = Sn, Ge

et al. 2021

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The recent discoveries of strikingly large zero-field Hall and Nernst effects in antiferromagnets Mn3X (X = Sn, Ge) have brought the study of magnetic topological states to the forefront of condensed matter research and technological innovation. These effects are considered fingerprints of Weyl nodes residing near the Fermi energy, promoting Mn3X (X = Sn, Ge) as a fascinating platform to explore the elusive magnetic Weyl fermions. In this review, we provide recent updates on the insights drawn from experimental and theoretical studies of Mn3X (X = Sn, Ge) by combining previous reports with our new, comprehensive set of transport measurements of high-quality Mn3Sn and Mn3Ge single crystals. In particular, we report magnetotransport signatures specific to chiral anomalies in Mn3Ge and planar Hall effect in Mn3Sn, which have not yet been found in earlier studies. The results summarized here indicate the essential role of magnetic Weyl fermions in producing the large transverse responses in the absence of magnetization.

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“…reflections of Ru and {0002} reflections of Mn3Sn, as presented in Fig. 1(d crystalline direction at almost 55° to the film normal, the [211 ̅̅̅̅ 0] magnetic easy axis [26] at approximately 35° to the film normal, and the [011 ̅ 0] crystallographic axis lying completely IP. This epitaxial relationship is illustrated in Fig.…”

mentioning

confidence: 92%

“…The inverse triangular spin texture also gives rise to a magneto-optical Kerr effect [20][21][22], which reveals that Mn3Sn contains AF domains possessing opposite chiralities of a cluster octupole order parameter [23] and, hence, opposite polarity of magnetotransport effects [24]. These chiral domains can be propagated [22] by coupling an external magnetic field to the small uncompensated magnetic moment [25] that is created in Mn3Sn by spins canting slightly towards magnetocrystalline easy axes [26]. This weak magnetization can freely rotate within the basal plane [5], acting to orient the entire inverse triangular spin structure into a single chiral domain state.…”

mentioning

confidence: 99%

Anomalous and topological Hall effects in epitaxial thin films of the noncollinear antiferromagnet Mn3Sn

et al. 2020

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Noncollinear antiferromagnets with a D019 (space group = 194, P63/mmc) hexagonal structure have garnered much attention for their potential applications in topological spintronics. Here, we report the deposition of continuous epitaxial thin films of such a material, Mn3Sn, and characterize their crystal structure using a combination of x-ray diffraction and transmission electron microscopy. Growth of Mn3Sn films with both (0001) c-axis orientation and (404 ̅ 3) texture is achieved. In the latter case, the thin films exhibit a small uncompensated Mn moment in the basal plane, quantified via magnetometry and x-ray magnetic circular dichroism experiments. This cannot account for the large anomalous Hall effect simultaneously observed in these films, even at room temperature, with magnitude σxy (µ0H = 0 T) = 21 Ω -1 cm -1 and coercive field µ0Hc = 1.3 T. We attribute the origin of this anomalous Hall effect to momentumspace Berry curvature arising from the symmetry-breaking inverse triangular spin structure of Mn3Sn. Upon cooling through the transition to a glassy ferromagnetic state at around 50 K, a peak in the Hall resistivity close to the coercive field indicates the onset of a topological Hall effect contribution, due to the emergence of a scalar spin chirality generating a real-space Berry phase. We demonstrate that the polarity of this topological Hall effect, and hence the chiral-nature of the noncoplanar magnetic structure driving it, can be controlled using different field cooling conditions.

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Magnetic anisotropy of single-crystalline Mn3Sn in triangular and helix-phase states

Abstract: FIG. 3. Torque at a magnetic field of 50 kOe in the temperature range from 260 to 280 K for (a) the (0001) plane and (b) the ð10 10Þ plane. (c) Fit of the torque for the (0001) plane at 280 K. (d) Temperature dependence of the anisotropy constants of Mn 3 Sn at 50 kOe.

Cited by 78 publications

References 28 publications

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Anomalous transport due to Weyl fermions in the chiral antiferromagnets Mn3X, X = Sn, Ge

Anomalous and topological Hall effects in epitaxial thin films of the noncollinear antiferromagnet Mn3Sn

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