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EuCo₂Al₉ is identified as a metallic spin supersolid with high thermal conductivity, exhibiting coexisting spin orders, strong quantum fluctuations and a giant magnetocaloric effect enabling efficient sub-Kelvin refrigeration.

Distinguishing the two models that have been proposed to explain stripe-like spin order in the iron-based superconductors is challenging. Avci et al.report an additional spin-ordered phase between this stripe phase and the superconducting state that suggests it originates from weak itinerant magnetism.

The use of antiferromagnetic materials in spintronic devices has been proposed as an attractive alternative to ferromagnets, but only a few suitable materials are known. Here, the authors synthesize a new antiferromagnet (AFM)—tetragonal epitaxial CuMnAs—and show that it is ideal for spintronic applications.

Ca₃Ru₂O₇ is a layered ruthenate, which undergoes a spin-reorientation transition where the spins rotate 90 degrees between two anti-ferromagnetic states. Despite extensive study, the driver of this transition has proved elusive. Here, using neutron and resonant x-ray scattering, Dashwood et al. show that this transition is driven by lattice strain.

The application of a high magnetic field is shown to induce spin-density-wave order in Sr₃Ru₂O₇. This magnetic order correlates with the electronic nematic behaviour observed in this material.

Experimental knowledge of magnetoelectric (ME) activity from magnetic multipole moments has so far been limited. Here, Kimura et al. show that a magnetic square cupola cluster such as Cu₄O₁₂ realized in Ba(TiO)Cu₄(PO₄)₄is a promising structural unit carrying ME-active magnetic quadrupole moments.

Quantum spin liquids have magnetic moments that do not form magnetic order even as the temperature approaches zero, leading to the dominance of quantum fluctuations. Chillal et al. present evidence that the hyper-hyperkagome lattice of PbCuTe₂O₆ hosts a three-dimensional quantum spin liquid.

Disorder emerges as a hidden tuning parameter in hole-doped iron-based superconductors, influencing phase transitions and magnetic properties. Here, the authors use neutron and x-ray diffraction to reveal a universal phase diagram, highlighting the role of atomic disorder in stabilizing magnetic phases and offering insights into the interplay of structural and magnetic parameters.

Multiferroic binary oxides with the perovskite structure have been very rare. Here, Cong et al. report magnetically-driven ferroelectricity and a large magnetoelectric effect in a binary perovskite compound Mn₂O₃ at low temperatures.

Chiral electric and magnetic structures are observed at domain walls in thin films of the room-temperature multiferroic BiFeO₃.

The application of multiferroics is often limited by low ordering temperatures. Here, the authors show that BaFe2O₄ is a room temperature antiferromagnet with improper ferroelectricity, suggesting it as a playground for the study of multiferroicity.

The Mott insulator Sr₂IrO₄ is intensively studied because of its electronic similarity to the high-temperature cuprate superconductor La₂CuO₄. Now, spectroscopic experiments reveal evidence for a hidden order with odd-parity symmetry in this system.

The reversal of spin chirality in the absence of any externally applied field would substantially broaden the use of chiral magnets for applications in spintronic devices. In this manuscript the authors demonstrate the spontaneous reversal of spin chirality in the topological magnet EuAl4 using resonant elastic x-ray scattering.

Nematic order in the iron-based superconductors breaks the symmetry between the x and y directions in the Fe plane. Beyond this, however, there is little consensus on how nematic order arises and whether it has an effect on superconductivity. This Review discusses the current theoretical and experimental state of the field.

The Fe-based superconductors are an ideal family of materials to investigate the mechanisms of unconventional superconductivity due to the co-existence of both magnetic and superconducting phases. Here, the authors experimentally demonstrate the presence of three magnetic phases in LaFeAs_1-xP_xO, which can be tuned as a function of phosphorus content, and discuss how the results connect to wider trends in magnetic and superconducting orders of the Fe-based superconductors.