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Shastry-Sutherland lattice materials offer a rich variety of accessible magnetic phases however, only a few have been observed to have ferromagnetic dimers, and among those, high quality single crystals are rare. Here, Marshall et al uses neutron diffraction on single crystals of BaNd2ZnS5, and show the existence of 2Q-antiferromagnetic order composed of ferromagnetic dimers and field-induced partial disorder. ‘

Altermagnets combine the spin splitting of ferromagnets and the magnetic ordering of collinear antiferromagnets. These technologically promising features have led to an aggressive search for altermagnetic materials. Here, Regmi et al synthesize CoNb₄Se₈, a layered intercalated material, and confirm altermagnetism via a combination of neutron and magnetotransport measurements and DFT calculations.

FeGe is an antiferromagnetic kagome metal with a rich magnetic and electronic phase diagram. Recently it was found that post-growth annealing of FeGe can suppress or induce charge density wave order depending on the annealing temperature. Here, Klemm, Siddique et al show the critical role that annealing induced Ge-vacancies and stacking faults play in the formation of charge density wave order in FeGe.

Whether an actual Mott insulator phase exists in iron pnictides remains elusive. Here, Songet al. demonstrate an antiferromagnetic insulator phase persisting above the Néel temperature in NaFe_1−xCu_xAs, indicative of a Mott insulator, highlighting the role of electron correlations in high-T_csuperconductivity.

PbFeO₃ is part of a family of lead based perovskites with many intriguing properties; however, difficulties in synthesis have hampered investigation. Here, the authors present a detailed study of the structure of PbFeO₃ observing unique charge ordering and spin orientation among the constituent ions.

Neutron scattering measurements provide evidence for strong coupling between stripe spin fluctuations, nematicity and superconductivity in single-crystalline FeSe.

MoTe₂ is reported to host type II topological Weyl semimetal states. Two sets of Weyl points exist at different energies above the Fermi energy. Fermi arcs that form closed loops and are unique to type II Weyl semimetals are also found.

The application of pressure effectively suppresses the spin–charge order in trilayer nickelate La₄Ni₃O_10−δ single crystals, leading to the emergence of superconductivity.

Magnetoelectric coupling, where magnetic and electronic order is linked, allows for the control of magnetism via an electric field and vice versa, potentially offering new approaches to data storage, sensors, actuators and wealth of other devices. Here, using a diverse array of experimental probes, Xu et al show the emergence of both diagonal and off-diagonal magnetoelectric coupling in CoTe₆O₁₃.

There is a class of quantum phase transitions that do not fit into the traditional Landau paradigm, but are described in terms of fractionalized degrees of freedom and emergent gauge fields. Hong et al. find evidence of such a transition in a molecular spin-1/2 antiferromagnetic ladder compound under hydrostatic pressure.

Toroidal moments arise from vortex like spin arrangements. These moments can then interact, giving rise to ferri- or ferro-toroidal order, though controlling such order is difficult. Here, the authors demonstrate a ferri-toroidal state in BaCoSiO₄, which under an applied magnetic field exhibits multiple toroidal and metamagnetic transitions.

A detailed neutron scattering and muon spin relaxation study uncovers a continuum of magnetic excitations down to 35 mK in the pyrochlore lattice compound Ce₂Zr₂O₇ with minimum chemical disorder, consistent with quantum spin liquid behaviour.

Extreme electronic anisotropy is revealed in the high-temperature superconductor FeSe through tour de force experiments on detwinned crystals.

Emergent quantum phenomena such as quantized anomalous Hall effect may be realized in magnetic topological materials. Here, Hu et al. discovered an intrinsic natural heterostructural Z₂ antiferromagnetic topological insulator MnBi₄Te₇ with low out-of-plane saturation fields.

Control of the electrical properties of materials by means of magnetic fields or vice versa may facilitate next-generation spintronic devices, but is still limited by their intrinsically weak magnetoelectric effect. Here, the authors report the existence of an enhanced magnetoelectric effect in a Y-type hexaferrite, and reveal its underlining mechanism.

Composition phase diagram of Eu_1−xSr_xMn_1−zSb₂ on the structural and magnetic transitions, Eu–Mn moment angle α, and nontrivial Berry phase is presented. A doping of nonmagnetic Sr on Eu site breaks lattice symmetry and induces various Eu spin reorientations that are coupled to quantum transport properties of the relativistic fermions generated the 2D Sb layers. Eu_1−xSr_xMn_1−zSb₂ is therefore a new unique material platform for exploring the Dirac band tuning by magnetism. Our study suggests nonmagnetic element doping to the rare-earth element site may be an effective strategy to generate topological electronic states and new magnetic states in layered compounds involving spatially separated rare-earth and transition metal layers.

By exploiting the geometric frustration of a kagome crystal lattice, it is possible to enhance electron localisation and engineer exotic electronic structures such as electronic flat bands. Here, the authors use inelastic neutron scattering to investigate the evolution of spin excitations modes for FeSn and CoSn, finding that an anomalous flat mode actually arises from the material used to fix the sample to the aluminium holder for analysis instead of the expected magnetic flat bands.

The scheelite-type DyCrO₄ shows a large linear magnetoelectric effect (magnetic field induced electric polarization) as well as the converse effect (electric field induced magnetization) within ± 3 T. A higher magnetic field induces a metamagnetic transition from the initially collinear antiferromagnetic structure to a canted one, generating a giant ferromagnetic component by about 7 μB f.u.⁻¹. The new spin structure can break the spatial inversion symmetry and yield spontaneous ferroelectric polarization, giving rise to the coupling of ferromagnetism and ferroelectricity in a single-phase material.