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Solidification upon heating, known as Pomeranchuk effect, is a known phenomenon for 3He. Here, leveraging on the hybridization of organic molecules orbitals with those of inorganic elements in polymers, the authors report the Pomeranchuk effect within an electronic system and the impact of magnetic fields on it.

The famous Fulde–Ferrell–Larkin– Ovchinnikov (FFLO) state is a spatially-modulated superconducting state with a predicted spatial anisotropy, but this anisotropy has never been experimentally verified. Here, the authors present ultrasound evidence for anisotropy of the sound velocity in the FFLO state of a 2D organic superconductor.

Frustrated quantum magnets have been studied intensely, owing to their potential of hosting exotic quantum magnetism, however, experimental realisation of model systems, such as the spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice is challenging. Here Gen et al demonstrate that the rhenium oxyhalides, A3ReO5X2, though chemical substitution can span a diverse effective spin Hamiltonians.

A combination of strong spin–orbit coupling and electronic correlations in pyrochlore iridates produces a quantum insulator–metal transition that can be induced by applying a magnetic field along specific crystalline axes.

Multiple different types of topological states are observed in iron-based high-temperature superconductors. This suggests that these may be a good place to try and engineer high-temperature topological superconductivity.

Recent theoretical work predicted an intermediate quantum spin liquid state in α-RuCl₃ in out-of-plane magnetic field. Zhou et al. present experimental evidence for this state between two magnetic transitions identified by high-field magnetization measurements.

Clear electronic transport signatures of topological nodal-line semimetals have been lacking due to their complex electronic structure and the presence of topologically trivial states. Kim et al. demonstrate that the quantum transport response in slightly hole-doped SrAs3 is dominated by nodal-line fermions.

There exist many theoretical models of frustrated quantum magnetism, most of which lack convincing experimental realisations. Here the authors combine several experimental methods to argue that KCu₆AlBiO₄(SO₄)₅Cl behaves as a square-kagome-lattice quantum Heisenberg antiferromagnet.