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Whilst CuO possesses spontaneous electrical polarization induced by its magnetic order, no magnetoelectric control of one by the other has been observed. Here, the authors demonstrate modification of the electrical polarization of CuO by suppressing its magnetic helix via an applied magnetic field.

Gapped quantum antiferromagnets can undergo field or pressure induced phase transitions to the magnetically ordered state, which have distinct critical exponents. While there are many examples of field induced transitions, thus far the pressure induced case has proven difficult to realize. Herein, the authors demonstrate such a pressure driven phase transition in the quantum antiferromagnet, DTN.

The Shastry-Sutherland compound SrCu₂(BO₃)₂ is a frustrated magnet that displays multiple magnetization plateaus in high magnetic fields. Nomura et al. report ultrasound and magnetostriction experiments reaching the saturation field for the first time and reveal new features in the phase diagram.

At low temperatures, the orbital degrees of freedom in insulating magnets normally do not fluctuate, leaving only magnetic behaviour. Measurements now suggest that in Pr₂Zr₂O₇, it is possible to reach a quantum regime of coupled spin–orbital dynamics.

A 3D quantum Hall effect has been reported in Dirac semimetal ZrTe₅ due to a magnetic-field-driven Fermi surface instability. Here, the authors show evidence of quasi-quantized Hall response without Fermi surface instability, but they argue that it is due to the interplay of the intrinsic properties of ZrTe₅ electronic structure and Dirac semi-metallic character.

The ultra-quantum limit refers to the high magnetic-field regime where electrons are confined to the lowest Landau level and is most easily reached in topological semimetals due to their low carrier density. Here, the authors study this regime in the Dirac semimetal ZrTe₅ and find evidence for a Lifshitz transition at moderate field, leading to the emergence of a 1D-Weyl band structure at high field.

Cu₂OSeO₃ possesses a helical spin structure which supports a rich phase diagram of magnetic states, including a lattice of particle-like skyrmions. Here, the authors use inelastic neutron scattering to elucidate the three-dimensional magnon spectrum and underlying spin Hamiltonian of Cu₂OSeO₃.

A thermodynamic probe of the recently discovered charge-density-wave order in YBa₂Cu₃O_y reveals a biaxial modulation in magnetic fields up to 40 T.