Enhancing the Resistive Memory Window through Band Gap Tuning in Solid Solution (CrV)O.

Memories based on the insulator-to-metal transition in correlated insulators are promising to overcome the limitations of alternative nonvolatile memory technologies. However, associated performances have been demonstrated so far only on narrow-gap compounds, such as (VCr)O, exhibiting a tight memory window. In the present study, V-substituted CrO compounds (CrV)O have been synthesized and widely investigated in thin films, single crystals, and polycrystalline powders, for the whole range of chemical composition (0 < < 1).

Revisiting the Crystal Structure of Layered Oxychalcogenides LnOS (Ln = La, Pr, and Nd).

LaOS was recently used as a precursor to prepare either a new metastable form of LaOS by de-insertion of half of sulfur atoms of (S) dimers or quaternary compounds by insertion of a coinage metal (e.g., LaOCuS).

Impact of the terahertz and optical pump penetration depths on generated strain waves temporal profiles in a VO thin film.

Triggering new stable macroscopic orders in materials by ultrafast optical or terahertz pump pulses is a difficult challenge, complicated by the interplay between multiscale microscopic mechanisms, and macroscopic excitation profiles in samples. In particular, the differences between the two types of excitations are still unclear. In this article, we compare the optical response on acoustic timescale of a VO Paramagnetic Metallic (PM) thin film excited by a terahertz (THz) pump or an optical pump, at room temperature.

Solvothermal and mechanochemical intercalation of Cu into LaOS enabled by the redox reactivity of (S) pairs.

Intercalation of Cu into layered polychalcogenide LaOS was demonstrated to be viable both under solvothermal conditions at 200 °C and mechanical ball milling at ambient temperature. This result evidences the soft-chemical nature of metal intercalation into layered polychalcogenides driven by the redox reactivity of anion-anion bonds.

Design of metastable oxychalcogenide phases by topochemical (de)intercalation of sulfur in LaOS.

Designing and synthesising new metastable compounds is a major challenge of today's material science. While exploration of metastable oxides has seen decades-long advancement thanks to the topochemical deintercalation of oxygen as recently spotlighted with the discovery of nickelate superconductor, such unique synthetic pathway has not yet been found for chalcogenide compounds. Here we combine an original soft chemistry approach, structure prediction calculations and advanced electron microscopy techniques to demonstrate the topochemical deintercalation/reintercalation of sulfur in a layered oxychalcogenide leading to the design of novel metastable phases.