Magnetic structure of the antiferromagnetic half-Heusler compound NdBiPt

Müller, R.; Désilets-Benoit, Alexandre; Gauthier, Nicolas; Lapointe, Luc; Bianchi, A.; Maris, Thierry; Zahn, R.; Beyer, R.; Green, D.; Wosnitza, J.; Yamani, Z.; Kenzelmann, M.

doi:10.1103/physrevb.92.184432

Cited by 28 publications

(19 citation statements)

References 38 publications

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“…For example, GdPtBi and NdPtBi exhibit magnetism arising from their 4f electrons preserving the Γ 8 -Γ 6 band inversion. The magnetic structures of these compounds are different: GdPtBi is a type-II antiferromagnet (18,19) whereas the magnetic structure of NdPtBi is of type I (20). Additionally, one should note that the magnetic moments and f-level fillings are distinct for neodymium and gadolinium and the exchange field is sufficiently large to reveal, for example, four pairs of Weyl points that appear in GdPtBi when B jj [111] (Fig.…”

Section: Significancementioning

confidence: 99%

“…1A) so that along the [111] direction, the structure can be described as a metallic multilayer formed from successive atomic layers of rare earth, platinum, and bismuth. GdPtBi (18,19) as well as NdPtBi (20) are antiferromagnetic (AFM) metals at low temperatures below their corresponding Néel temperatures, T N = 9.0 and 2.1 K, respectively. The Gd spins order antiferromagnetically without any canting in zero magnetic field (as evidenced from μSR, discussed later) and saturate into a fully spin-aligned magnetic state in high magnetic fields at low temperatures [e.g., 25 T at 1.4 K ( Fig.…”

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confidence: 99%

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Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd)

Shekhar

Kumar

Grinenko

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

164

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Topological materials ranging from topological insulators to Weyl and Dirac semimetals form one of the most exciting current fields in condensed-matter research. Many half-Heusler compounds, RPtBi (R = rare earth), have been theoretically predicted to be topological semimetals. Among various topological attributes envisaged in RPtBi, topological surface states, chiral anomaly, and planar Hall effect have been observed experimentally. Here, we report an unusual intrinsic anomalous Hall effect (AHE) in the antiferromagnetic Heusler Weyl semimetal compounds GdPtBi and NdPtBi that is observed over a wide temperature range. In particular, GdPtBi exhibits an anomalous Hall conductivity of up to 60 Ω⋅cm and an anomalous Hall angle as large as 23%. Muon spin-resonance (μSR) studies of GdPtBi indicate a sharp antiferromagnetic transition () at 9 K without any noticeable magnetic correlations above Our studies indicate that Weyl points in these half-Heuslers are induced by a magnetic field via exchange splitting of the electronic bands at or near the Fermi energy, which is the source of the chiral anomaly and the AHE.

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Section: Significancementioning

confidence: 99%

mentioning

confidence: 99%

Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd)

Shekhar

Kumar

Grinenko

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

164

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show abstract

“…Thus, it is clear that the Heusler name now refers to a broad and extensive family of compounds. Furthemore, all of these variants can be subjected to various structural distortions including a tetragonal elongation or compression along one of the cubic crystal axes, or a distortion along the [111] direction that leads to an hexagonal structure (9). Finally, superstructures are sometimes found that can arise from chemical ordering in non-stoichiometric compounds or from modulation of the structure and structural phase transitions, for example, in the case of shape memory alloys.…”

Section: Typementioning

confidence: 99%

“…Consequently, a connection between topological insulators, the zero gap-state, and thermoelectric performance is profound (87). [111] I [110] [111] I (a) [110] Weyl semimetals (WSM) are a class of topological semimetals, beyond topological insulators, where the conduction and valence bands cross in the vicinity of the Fermi level (88,89,90,91,92,93,94,95,96,97,98,99,100). The crossing points are called Weyl points that are separated in momentum space.…”

Section: Non-collinear Magnetic Structurementioning

confidence: 99%

Heusler 4.0: Tunable Materials

Wollmann

Nayak

Parkin³

et al. 2017

Annu. Rev. Mater. Res.

168

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Heusler compounds are a large family of binary, ternary, and quaternary compounds that exhibit a wide range of properties of both fundamental and potential technological interest. The extensive tunability of the Heusler compounds through chemical substitutions and structural motifs makes the family especially interesting. In this article we highlight recent major developments in the field of Heusler compounds and put these in the historical context. The evolution of the Heusler compounds can be described by four major periods of research. In the latest period, Heusler 4.0 has led to the observation of a variety of properties derived from topology that includes topological metals with Weyl and Dirac points; a variety of noncollinear spin textures, including the very recent observation of skyrmions at room temperature; and giant anomalous Hall effects in antiferromagnetic Heuslers with triangular magnetic structures. Here we give a comprehensive overview of these major achievements and set research into Heusler materials within the context of recent emerging trends in condensed matter physics

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“…Note that the peak splitting described above in three scenarios during the temperature evolution of the magnetic contribution to heat capacity is observed in real rare-earth antiferromagnets [7,[41][42][43][44][45][46][47][48] and actinide compounds [49], as well as a number of organometallic coordination polymers [50,51], molecular [52] and quasi-one-dimensional frustrated [53] magnets.…”

Section: Thermodynamics Of the System In The Frustration Regime Anmentioning

confidence: 77%

Frustrations and orderings in Ising chain with multiple interactions

Zarubin

Kassan‐Ogly

Proshkin

2019

J. Phys.: Conf. Ser.

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We study the frustration properties of the Ising model on a one-dimensional monoatomic equidistant lattice, taking into account the exchange interactions of atomic spins at the sites of the nearest, next-nearest, and third neighbors. The exact analytical expressions for the thermodynamic functions of the system are obtained using the Kramers-Wannier transfer matrix technique. Criteria for the emergence of magnetic frustrations in the presence of competition between the energies of exchange interactions are formulated. The points and intervals of the existence of frustrations, which depend on the values and signs of the exchange interactions, are found. The features of the entropy and heat capacity of this model in the frustration regime and its vicinity are investigated. Non-zero entropy values of the ground state of a frustrated system, as well as a two-peak temperature structure of the heat capacity in the vicinity of the frustration point, are found. at the sites of the nearest, second, and third neighbors (J 1 < 0, J 2 < 0, J 3 < 0), the lines emerging from the point (31) defining the boundaries of the spin configurations C A4 , C A6 and C A2 are given byfor regions C A4 and C A6 with the energy of states at the boundary E = J 2 , and alsofor the boundary between the configurations C A6 and C A2 with the energy E = J 3 . In the ferro-antiferro-ferromagnetic variant of the exchange interaction parameters (J 1 > 0, J 2 < 0, J 3 > 0), the lines emerging from the point (31) defining the boundaries of the spin configurations C A4 , C A3 and C F2 are given by the expressions

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Magnetic structure of the antiferromagnetic half-Heusler compound NdBiPt

Cited by 28 publications

References 38 publications

Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd)

Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd)

Heusler 4.0: Tunable Materials

Frustrations and orderings in Ising chain with multiple interactions

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