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The authors study epitaxial thin films of the pyrochlore-sublattice compound LiTi2O4 by RIXS and ARPES. They observe cooperation between strong electron correlations and strong electron-phonon coupling, giving rise to a mobile polaronic ground state in which charge motion and lattice distortions are coupled.

The Mermin-Wagner theorem states that for short-range isotropic interactions, magnetic order in two dimensions is destroyed by magnetic fluctuations at finite temperatures. Observing this situation is challenging due to the finite size of typical laboratory samples. Here, Kiaba et al observe the suppression of magnetic order in oxide superlattices, at the thickness of the superlattice layers are reduced to one monolayer.

Recently, periodic arrays of thermally active nanomagnets with bistable magnetization have been built which mimic the behaviour of frustrated magnets and model Ising systems. Here, the authors use muon spin relaxation to evidence thermodynamic phase transitions in an artificial kagome ice system.

The relationship between superconductivity and antiferromagnetism is an unresolved question in electron-doped high-T_c superconductors. Saadaoui et al. perform low-energy muon spin relaxation measurements to study the phase diagram of La_2−xCe_xCuO_4−δat the magnetic-superconducting transition region.

One of the challenges posed by spin manipulation in organic semiconductors is the difficulty of measuring the spin polarization and the spin diffusion length. This is now elegantly achieved by a low-energy muon spin rotation.

Time-reversal symmetry breaking has been recently observed in the normal state of kagome superconductors AV₃Sb₅. Here the authors show that this effect is significantly enhanced near the surface of RbV₃Sb₅ and occurs at temperatures higher than the onset of charge order, indicating its tunability under zero-field conditions.

The strong dependence of the magnetic properties on the growth conditions in (Ga, Mn)As has created the view that ferromagnetism is associated with an intrinsic inhomogeneity. Muon-spin-relaxation experiments now show that strong and homogeneous ferromagnetism is instead present in both insulating and metallic films.

A switchable induced magnetic moment in a non-magnetic metal that is separated from a ferromagnet by a thick superconducting layer contradicts existing models.

Strontium Ruthenate, Sr₂RuO₄, displays a remarkable number of intriguing physical phenomena, from superconductivity, to strain-induced ferromagnetism. Here, using low-energy muon spectroscopy, Fittipaldi et al. demonstrate the existence of unconventional magnetism at the surface of Sr₂RuO₄ in its normal state and without any applied strain.

The chemical versatility of organic semiconductors promises to be of great use to electronics and spintronics. As an example, it is now demonstrated that the spin polarization of extracted carriers from an organic semiconductor device can be controlled by the insertion of a thin layer of polar material. This approach opens up ideas for future spintronic device concepts.

Improved electron microscopy methods are used to map a mammalian retinal circuit of close to 1,000 neurons; the work reveals a new type of retinal bipolar neuron and suggests functional mechanisms for known visual computations.

The dynamics of spins in single atomic layers of cuprates and other compounds are important for understanding their properties, such as magnetism and high-temperature superconductivity. Now, spin excitations in isolated single layers of a cuprate have been measured, providing valuable feedback on their magnetic properties.