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A method of nanometre-level patterning of high-density extended 1D and 2D defects in thin films of perovskite oxides is developed.

Competing phases in layered complex oxides are believed to be relevant for emergent phenomena, which still await to be witnessed. Here, Stone et al. report direct atomic-scale imaging of a multitude of polar phases in Ruddlesden-Popper oxide thin films, exhibiting diverse phenomena in a single structure.

Measurements indicate that electrons move in loops between the atoms of an intriguing class of superconducting material. Such dynamics breaks key symmetries of the crystal lattice — suggesting the material hosts a rare state of matter.

The electric polarization of materials called ferroelectrics is often suppressed by an internal electric field, limiting uses for these materials. The discovery of a thin-film ferroelectric that is resistant to this field represents a major advance.

The authors use angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy (STM) to study the charge density wave (CDW) in the kagome material ScV₆Sn₆. The ARPES data shows minimal changes to the electronic structure in the CDW state, while STM quasiparticle interference measurements imply a strong reconstruction of the electronic structure in the CDW state.

Field-driven insulator-to-metal transition and associated colossal magnetoresistance have been reported in the magnetic nodal-line semiconductor Mn₃Si₂Te₆. Gu et al. measure infrared response across magnetic ordering and the transition, revealing a weakly metallic state instead of a traditional metallic state.

The coexistence of crystallographic polarity and chirality is rare in a superconductor. Here, the authors establish that Mo₃Al₂C is a superconductor with crystallographic polarity and chirality simultaneously.

A correlated material SrVO₃ has been considered to be a Fermi liquid, however previous studies have been limited to disordered samples. Here the authors study transport in ultraclean films of SrVO₃, finding deviations from the Fermi liquid picture.

The charge-density-wave state in RbV₃Sb₅ can be optically manipulated by applying linearly polarized light along high-symmetry directions, which demonstrates the potential of light as a control knob to manipulate complex quantum phenomena in correlated materials.

Can support polarisation introduce an extra degree of freedom in catalyst scaling relations? This research considers a computational approach for studying catalysts on polar supports and identifies the origin of broken scaling relations.

Whilst terahertz optical spectroscopy allows for the study of coupled spin and lattice excitations, it is limited in momentum space. Here, the authors use inelastic x-ray scattering to demonstrate strong magnon-phonon coupling and electromagnon excitations across the Brillouin zone of LiCrO₂.

Spin-state crossovers are phenomena where, under changes in temperature or pressure, the spin-state of an ion changes. In some materials, this spin-state crossover occurs simultaneously with a metal-insulator transition, driven by a valence transition. Control over such valence, spin-state, and metal-insulator transitions has much technological appeal, but, thus far, materials displaying this have been limited to cryogenic temperatures. Here, the authors show that in strained films of (Pr1-yYy)1- xCaxCoO3-δ, these transitions can be promoted to room temperature.

The authors show a hysteretic behaviour of superconductivity as a function of electric field in bilayer Td-MoTe₂, representing observations of coupled ferroelectricity and superconductivity.

Certain delafossite materials are the most conductive oxides known, for poorly understood reasons. This work elucidates this finding by uncovering a sublattice purification mechanism that enables ultrapure conductive planes even in impure crystals.

A new family of tunable microwave dielectrics with unparalleled performance at frequencies up to 125 GHz at room temperature has been created, using dimensionality to add and control a local ferroelectric instability in a system with exceptionally low dielectric loss.

Kagome metals can house a complex interplay of competing phenomenon and there has been significant investigation into how to engineer the resultant properties, as well as understand the underlying physics. Here, the authors investigate the competition between charge density wave order and superconductivity for CsV₃Sb₅ using a combination of high-pressure and muon spin rotation measurements.

Optically transparent electrodes with high electrical conductance are essential for the implementation of optoelectronics, but current technology performs poorly in the ultraviolet regime. Here, SrNbO₃ is proposed as an alternative material due to its high figure of merit in the ultraviolet range.