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There has been significant interest in using spin-waves or magnons for information processing, due to their low energy dissipation and short wavelength at terahertz frequencies, however, manipulating magnons can be challenging. Here, Kim et al show that magnons in Sr2IrO4 are extremely strain sensitive, with small applied strains leading to large variation in the magnon energy.

Interaction between Cooper pairs and other collective excitations may reveal important information about the pairing mechanism. Here, the authors observe a universal jump in the phase of the driven Higgs oscillations in cuprate thin films, indicating the presence of a coupled collective mode, as well as a nonvanishing Higgs-like response at high temperatures, suggesting a potential nonzero pairing amplitude above Tc.

This study shows atomic-scale observations of geometric reconstruction in a fluorine-intercalated infinite layer nickelate superlattice, highlighting how fluorine influences the material’s structure and electronic properties.

Identifying external mechanisms to tune magnon properties has remained a major challenge. Here, the authors demonstrate that an interfacial metal-insulator transition offers an effective method for controlling the magnon dispersion of Sr₂IrO₄.

This work reports on high-resolution inelastic X-ray scattering experiments revealing a striking renormalization of the phonon spectra of high-T_c cuprates associated with the formation of charge density waves. Their origin is attributed to the hybridization of phonons with dispersive collective excitations of the charge density waves, providing insights in the role of electron-phonon interaction in high temperature superconductors.

Measurements of the spin susceptibility in a model cuprate reveal the presence of two distinct gaps underlying the pseudogap behaviour. One gap is attributed to charge density waves and the other to the predicted formation of spin singlets.

Different facets of an orthorhombic substrate can stabilize different ordering patterns in a perovskite oxide, even in the absence of differences in strain and polarity mismatches.

Resonant X-ray scattering experiments have revealed a charge-ordered phase next to the recently discovered superconducting phase in layered nickelates — in remarkable analogy to the cuprate high-temperature superconductors.

The occupation of electronic orbitals on the surface and interface of oxide thin films and heterostructures is a key influence over their properties, including magnetism and superconductivity. A new spectroscopy technique now provides the first quantitative, spatially resolved data of orbital occupation in oxide structures.

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.

Surface polarity affects the electronic and structural properties of oxide thin films through electrostatic effects, which is challenging to control. Here, the authors probe the tunable surface polarity at the atomic scale.

Cuprate superconductors are known for their intertwined interactions and coexistence of competing orders. Here, the authors observe a Fano resonance in the nonlinear THz response of La_2-xSr_xCuO₄, which may arise from a coupling between superconducting and charge-density-wave amplitude fluctuations.

The discovery that the rotation of the orbital arrangement in manganites induces ferroelectricity exposes an intriguing phase transition that could serve as a blueprint for novel applications.

High-pressure synthesis is used to stabilize superconducting (Ba,K)SbO₃, whose properties provide a fresh perspective on the origin of superconductivity in these types of materials.

Finding a parameter that limits the critical temperature of cuprate superconductors can provide crucial insight on the superconducting mechanism. Here, the authors use inelastic photon scattering on two Ruddlesden-Popper members of the model Hg-family of cuprates to reveal that the energy of magnetic fluctuations may play such a role, and suggest that the Cooper pairing is mediated by paramagnons.

Collective quantum phenomena such as magnetism, superfluidity and superconductivity have been pre-eminent themes of condensed-matter physics in the past century. Neutron scattering has provided unique insights into the microscopic origin of these phenomena.

High-entropy alloys are interesting as they enable the stabilization of high-symmetry phases, giving rise to unique emerging properties. Here, selenium fluctuations in (Ag,Sn)Se are investigated, revealing their role in promoting superconductivity and stabilizing the cubic rocksalt structure.

A careful study of quantum oscillations of single crystals of the cuprate superconductor YBCO placed under a magnetic field reveals a sawtooth behaviour that is reminiscent of two-dimensional electronic systems—in turn suggesting the existence of a so-called ‘hard antinodal gap’ in this system.

The electronic properties of complex oxide heterostructures are governed by the physics at the interface between the different materials. Here, the authors use infrared ellipsometry and confocal Raman spectroscopy to show the presence of non-collinear and asymmetric interfacial polar moments in SrTiO₃-based heterostructures underlying the important role of oxygen vacancies in these systems.

The relationship between superconductivity and charge density waves is one of the unresolved mysteries of high temperature cuprate superconductors. The authors investigate this relationship using multilayers of cuprates and manganites for which the charge and orbital order of the latter is controlled by chemical substitution.