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Recent theoretical studies indicate that the Kitaev model may be realized in framework materials exhibiting extended superexchange pathways. Here the authors report experimental evidence showing that the material requirements for a Kitaev quantum spin liquid are satisfied in a inorganic framework material.

The spin–orbit interaction and the two-dimensional honeycomb structure of iridium-based oxides are promising for exotic electronic states. Here, the authors find an iridium oxide with a three-dimensional structure that preserves the features of the honeycomb systems, creating new material possibilities.

Many of the fundamental effects in condensed matter physics can be described in the framework of quasiparticles. Here, the authors observe quasiparticles related to the antiferromagnetic state in quasi-two-dimensional Sr₂IrO₄, showing close resemblances to elusive quasiparticles in cuprate superconductors.

In the copper oxide superconductors, spin fluctuations might be involved in the electronic pairing mechanism. The case for such magnetically mediated superconductivity is now strengthened by the discovery of high-energy magnetic excitations that are not affected by chemical doping levels within several cuprates.

Water is the most common liquid in nature, with unusual properties that could be linked to the peculiar hydrogen-bonding network holding the molecules together. Here, Nilsson and Pettersson review recent progress in searching the connections between local configurations and thermodynamic responses of water.

Resonant magnetic excitations are common in unconventional superconductors, but the mechanism for their formation is elusive. Using inelastic neutron scattering, this study finds similar excitations in the non-superconducting heavy-fermion metal CeB₆, suggesting common behaviour between the two ground states.

The interaction between electrons and phonons is important for many materials properties. The finding that phonon modes of a superconducting thin film can influence the properties of an adjacent normal conductor, even over comparatively long distances, suggests new ways of controlling electron–phonon interactions.

Inelastic X-ray scattering studies of YBa₂Cu₃O_6.6 reveal strong electron-phonon coupling and an inhomogeneous state made up of charge-density-wave nanodomains, which may explain some anomalous properties of the pseudogap state.

Resonant inelastic X-ray scattering at the 4d-edge reveals dispersive magnetic excitations in SrRu₂O₆, providing insight into the origin of its high Néel temperature.

Graphite remains stable at pressures higher than those of its equilibrium coexistence with diamond. This has proved hard to explain, owing to the difficulty in simulating the transition with accuracy. Ab initio calculations using a trained neural-network potential now show that the stability of graphite and the direct transformation of graphite to diamond can be accounted for by a nucleation mechanism.

An inelastic neutron scattering study of the two-dimensional antiferromagnet Ca₂RuO₄ reveals evidence for a condensed-matter analogue of the Higgs mode, and its subsequent decay into transverse Goldstone modes.

RuCl₃ has stood out as a prime candidate in the search for quantum spin liquids; however, its antiferromagnetic ordering at low temperature suggests deviations from typical QSL models. Here, using resonant inelastic x-ray scattering, the authors provide a comprehensive determination of the low energy effective Hamiltonian.

Honeycomb iridates have been proposed as experimental realizations of the Kitaev model. An X-ray scattering study presents evidence for bond-directional interactions in Na₂IrO₃, a key requirement to make the connection with Kitaev physics possible.

We establish a spin nematic phase in the square-lattice iridate Sr₂IrO₄ and find a complete breakdown of coherent magnon excitations at short-wavelength scales, suggesting a many-body quantum entanglement in the antiferromagnetic state.

Inelastic neutron scattering characterization shows that α-RuCl₃ is close to an experimental realization of a Kitaev quantum spin liquid on a honeycomb lattice. The collective excitations provide evidence for deconfined Majorana fermions.

The Kitaev quantum spin liquid is an exotic phase of matter exhibiting long-range entanglement and emergent Majorana fermions. This Review summarizes the concept and recent progress in realizing Kitaev model physics in transition metal compounds.

Oxide heterostructures offer new functionality based on the interaction of order parameters across the heterostructure interfaces. In particular, it is now demonstrated that superconducting layers can induce giant modulations of magnetization in adjacent ferromagnetic layers.

This Perspective lays out the impetus and goals of the Cellular Senescence Network established to comprehensively identify and characterize senescent cells (SnCs) across tissues and lifespan, providing a publicly available SnC atlas.

Surprising phenomena are known to occur when magnetic systems are confined to low-dimensional geometries. A resonant X-ray scattering study of NdNiO₃ slabs reveals a crossover between different magnetic ground states as a function of thickness.