Search

The half-Heusler GdPtBi is found to show transport and calorimetric signatures of the existence of Weyl fermions under the application of a magnetic field. The half-Heusler alloys form a big family of tunable compounds that may substantially enlarge the number of Weyl semimetals known.

In the magneto-optical Kerr effect, light incident on a magnetic material is reflected with a shifted polarization, the size of the shift characterized by the Kerr angle. Here, Kato et al introduce a topological magneto-optical Kerr effect, where the presence of skyrmions, a type of topological spin texture, leads to a significant enhancement of the Kerr signal.

The antiferromagnet CoNb₃S₆ with chiral crystal lattice has near-zero magnetization, but exhibits a large thermoelectric Nernst effect in zero magnetic field, attributed to topological nodal planes in its electronic structure and magnetic spin-space group symmetries in the ordered state.

Understanding and controlling the skyrmion lattice (SkL) phase facilitates its versatile applications. Here the direct observation of a SkL phase with large topological Hall effect in centrosymmetric Gd₃Ru₄Al₁₂ is reported, which is stabilized by thermal fluctuations and magnetic field without Dzyaloshinskii-Moriya interactions.

A thermodynamic study of doped single crystals of NbFe₂ reveals the phase diagram of this system as a function of temperature, magnetic field and Nb doping — which includes an unusual quantum tricritical point.

The emergent electrodynamics induced by skyrmion lattice motion in Gd₂PdSi₃ is facilitated by its giant topological Hall effect dynamic transition, and implies the emergent Galilean relativity of current-driven skyrmions.

Helimagnetic materials host a twisted magnetic texture, realizing screws, cycloids, and cones. While helimagnets are common in three dimensional materials, layered van der Waals helimagnets are exceedingly rare. Here, Akatsuka et al. demonstrate conical ordering in the easily cleavable magnet DyTe3.

Van der Waals (Cr,Bi)₂Te₃, synthesized by non-equilibrium molecular beam epitaxy, is characterized by magnetotransport measurements and shown to be a semimetallic Weyl ferromagnet, with Fermi surface composed of two Weyl points and no irrelevant electronic states.

The magnetoresistance effect in WTe₂, a layered semimetal, is extremely large: the electrical resistance can be changed by more than 13 million per cent at very high magnetic fields and low temperatures.

Noncoplanar magnets are promising for spintronics but are rare and challenging to find. Here, the authors provide a chemical design strategy to produce materials with noncoplanar magnetic orders, and strong signatures of their magnetism in the Hall effect.

The half-Heusler GdPtBi is reported to exhibit negative longitudinal magnetoresistance. This is attributed to the chiral anomaly due to the formation of Weyl nodes with an applied magnetic field. The anomaly is also found to suppress the thermopower.

The antiferromagnetic material haematite, named for its blood-red colour, hosts swirling spin vortices termed merons. The rotation sense of such antiferromagnetic vortices has now been imaged in real space.

Zero Hall effect is found in the quantum limit of KHgSb. This observation is attributed to counter-propagating double quantum spin Hall states.

The polar magnetic semimetal NdAlSi hosts Weyl fermions that promote helical magnetism, and defines a roadmap for future work on correlated topological matter.

Topological surface states in lead-doped tin selenide are assumed to arise from massive Dirac states in the bulk, but this has not been demonstrated to date. Using thermoelectric transport measurements, Liang et al.now close this gap, and further show a sign anomaly in the Nernst signal due to band inversion.

Skate-specific changes in the epigenome and its three-dimensional organization contributed to the evolution of the batoid fin morphology.

Microscale magnetic devices containing nanoscale spin helices produce an inductance comparable in magnitude to that of a commercial inductor, in a volume about a million times smaller.

Experimental realizations of magnetic skyrmions, particle-like spin swirls with topological protection, so far have required inversion symmetry breaking or a geometrically frustrated lattice. In centrosymmetric GdRu₂Si₂, in which a geometrically frustrated lattice is absent, a skyrmion lattice phase emerges, which is probably stabilized by four-spin interactions mediated by itinerant electrons in the presence of easy-axis anisotropy.

The authors report a strongly temperature-dependent thermal conductivity at low temperature, consistent with topological bosonic modes in a Chern-insulator-like model.

Transport measurements on the Kitaev quantum spin liquid candidate α-RuCl3 subjected to a magnetic field reveal oscillating behaviour in its thermal conductivity, reminiscent of Shubnikov de Haas oscillations in metals.