Glassy ferromagnetism in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">Sn</mml:mi></mml:mrow></mml:math>-type<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:mn>3.1</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Sn</mml:mi><mml:mn>0.9</mml:mn></mml:msub></mml:mrow>

Feng, Wenjiang; Li, Didi; Ren, Weijun; Li, Y. B.; Li, W. F.; Li, J.; Zhang, Y. Q.; Zhang, Z. D.

doi:10.1103/physrevb.73.205105

Cited by 67 publications

(52 citation statements)

References 33 publications

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“…The chiral antiferromagnetic order has orthorhombic symmetry and thus induces a very tiny magnetization ∼2 mµ B per Mn, which is essential to switch the non-collinear antiferromagnetic structure by using magnetic field. On further cooling below ∼50 K, a clusterglass phase appears as spins cant toward [0001] (c axis) 25,27,28 Supplementary Fig. 1), namely, The zero-field value is ∼50 −1 cm −1 at 300 K for both samples and it becomes particularly enhanced for Sample 2 at low temperatures and reaches 120 −1 cm −1 at 100 K. The sign change in the Hall effect as a function of field should come from the flipping of the tiny uncompensated moment that follows the rotation of the sublattice moments 10,24,26 .…”

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Large anomalous Nernst effect at room temperature in a chiral antiferromagnet

et al. 2017

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A temperature gradient in a ferromagnetic conductor can generate a transverse voltage drop perpendicular to both the magnetization and heat current. This anomalous Nernst e ect has been considered to be proportional to the magnetization 1-7 , and thus observed only in ferromagnets. Theoretically, however, the anomalous Nernst e ect provides a measure of the Berry curvature at the Fermi energy 8,9 , and so may be seen in magnets with no net magnetization. Here, we report the observation of a large anomalous Nernst e ect in the chiral antiferromagnet Mn 3 Sn (ref. 10). Despite a very small magnetization ∼0.002 µ B per Mn, the transverse Seebeck coe cient at zero magnetic field is ∼0.35 µV K −1 at room temperature and reaches ∼0.6 µV K −1 at 200 K, which is comparable to the maximum value known for a ferromagnetic metal. Our first-principles calculations reveal that this arises from a significantly enhanced Berry curvature associated with Weyl points near the Fermi energy 11 . As this e ect is geometrically convenient for thermoelectric power generation-it enables a lateral configuration of modules to cover a heat source 6 -these observations suggest that a new class of thermoelectric materials could be developed that exploit topological magnets to fabricate e cient, densely integrated thermopiles.Current intensive studies on thermally induced electron transport in ferromagnetic materials have opened various avenues for research on thermoelectricity and its application [12][13][14][15] . This trend has also triggered renewed interest in the anomalous Nernst effect (ANE) in ferromagnetic metals [3][4][5][6][7]15 , which is the spontaneous transverse voltage drop induced by heat current and is known to be proportional to magnetization (Fig. 1a). On the other hand, the recent Berry phase formulation of the transport properties has led to the discovery that a large anomalous Hall effect (AHE) may arise not only in ferromagnets, but in antiferromagnets and spin liquids, in which the magnetization is vanishingly small 10, [16][17][18][19][20][21][22] . As the first case in antiferromagnets, Mn 3 Sn has been experimentally found to exhibit a large AHE 10 . While the AHE is obtained by an integration of the Berry curvature for all of the occupied bands, the ANE is determined by the Berry curvature at E F (refs 8,9). Thus, the observation of a large AHE does not guarantee the observation of a large ANE. Furthermore, the ANE measurement should be highly useful to clarify the Berry curvature spectra near E F and to verify the possibility of the Weyl metal recently proposed for Mn 3 Sn (ref. 11).Mn 3 Sn has a hexagonal crystal structure with a space group of P6 3 /mmc (ref. 23). Mn atoms form a breathing type of kagome lattice in the ab-plane (Fig. 1b), and the Mn triangles constituting the kagome lattice are stacked on top along the c axis forming a tube of face-sharing octahedra. On cooling below the Néel temperature of 430 K, Mn magnetic moments of ∼3µ B lying in the ab-plane form a coplanar, chiral magnetic structure chara...

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Large anomalous Nernst effect at room temperature in a chiral antiferromagnet

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“…Mn 3.1 Sn 0.9 shown in Fig. 1(a) [12]. The index table of the XRD patterns, observed and calculated for Mn 3.1 Sn 0.9 N compound, is represented in Table 1.…”

Section: Structural Propertiesmentioning

confidence: 99%

“…The magnetic measurements revealed that, for Mn 3.1 Sn 0.9 compound, glassy ferromagnetism exists below 31.8 K, and the mechanism of its formation was explored in detail [12]. The field dependences of the glassy freezing temperature T f and the transitional temperature T t (defined as the temperature of the occurrence of the large FM) were measured for Mn 3.1 Sn 0.9 compound [12].…”

Section: Magnetic Propertiesmentioning

confidence: 99%