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A thin-film engineering method is employed to preserve high pressure solids in diamond capsules at ambient conditions, enabling tunable preserved pressures, controllable particle size, atomic-scale characterization, and potential large-scale uses.

Superconductivity was recently discovered in La₄Ni₃O₁₀ under pressure in proximity to a density-wave phase. Here, by stabilizing a tetragonal form of La₄Ni₃O₁₀ at ambient pressure, the authors show that the density-wave state is crucial for the superconductivity, but the tetragonal structure is not.

It is a challenge to control composition gradient of ferroelectric films. Here, the authors develop a solution epitaxy strategy to produce compositionally-graded ferroelectric films with excellent dielectric stability and high pyroelectric property.

An alternative approach to physical vapor deposition is demonstrated here for accessing ultrastable metallic glasses via the glass-to-glass transition, a bulk transformation that is inherently free from size constraints and anisotropy.

By overcoming the limited solubility of other lighter components in aluminum using high pressure and high temperature, a low-density, high specific strength, and single-phase aluminum-based complex concentrated alloy is developed.

The understanding of polyamorphic transitions is of scientific and technological importance. Here, the authors report a continuous polyamorphic transition without first-order transition characteristics in high-entropy metallic glasses.

The nanostructured diamond capsule process with the inert gases solid argon and neon is demonstrated, where the trapped volatile gases could sustain their high-pressure states without confinement of conventional high-pressure vessels, opening up the possibility of in-depth investigations of high-pressure phenomena.

Whether a polymorphic transition exists in high entropy alloys or not remains unclear since discovery of these alloys more than a decade ago. Here authors report an irreversible polymorphic transition fromfcc to hcp in the prototype FeCoCrMnNi high entropy alloy and provide evidence for fccphase being more stable than hcp phase only at high temperatures.

The application of pressure effectively suppresses the spin–charge order in trilayer nickelate La₄Ni₃O_10−δ single crystals, leading to the emergence of superconductivity.

While metallic glasses are expected to have tunable structures, these have rarely been demonstrated. Here, the authors combine temperature and pressure to show a two-way structural tuning in rare earth-based metallic glasses beyond the nearest-neighbor atomic shells.

Diamond’s properties are dictated by its crystalline, fully tetrahedrally bonded structure. Here authors synthesize a bulk sp ³-bonded amorphous form of carbon under high pressure and temperature, show that it has bulk modulus comparable to crystalline diamond and that it can be recovered under ambient conditions.

Glass-to-glass transitions can help understanding the glass nature, but it remains difficult to tune metallic glasses into significantly different glass states. Here the authors demonstrate the high-entropy effects in glass-to-glass transitions of high-entropy metallic glasses.

Narrow, long graphene nanoribbons with atomically smooth and defect-free edges can be produced by squashing carbon nanotubes, and can be used to fabricate a sub-3-nm-wide channel field-effect transistor with a mobility of 2,443 cm² V⁻¹ s⁻¹.

Developing low-temperature solution epitaxy and elucidating its underlying mechanisms is highly desired for low-cost fabrication of single-crystal ferroelectric films. Here, the authors show that a polarization screening between ferroelectrics and substrates can tailor the interface energy and drive the solution epitaxy of polarization-gradient ferroelectric oxide films, demonstrating a remarkable photovoltaic effect.

The synthesis and characterization of new crystalline-amorphous hybrid materials is challenging. Here, the authors report the preparation of a nested order-disorder framework by applying high pressure to a nested copper chalcogenide Cu₁₂Sb₄S₁₃.

Controlling the properties of transition metal chalcogenides enables the study of new condensed-matter phenomena and the development of potential applications. Here, the authors continuously tune the crystal and electronic structure of molybdenum diselenide away from the pristine state using pressure.

Ordered oxygen complexes in high-entropy alloys enhance both strength and ductility in these compositionally complex solid solutions.

High entropy oxides can exhibit remarkable properties which may be amenable to pressure tuning. Here a fluorite-type high entropy oxide is shown to undergo pressure-induced lattice distortion with associated changes to optical behaviour.