Article 4 – Ferri-ionic Coupling in CuInP2S6 Nanoflakes: Polarization States and Controllable Negative Capacitance

Abstract:

We consider nanoflakes of van der Waals ferrielectric CuInP2S6 covered by an ionic surface charge and reveal the appearance of polar states with relatively high polarization ~5 microC/cm2 and stored free charge ~10 microC/cm, which can mimic „mid-gap” states associated with a surface field-induced transfer of Cu and/or In ions in the van der Waals gap. The change in the ionic screening degree and mismatch strains induce a broad range of the transitions between paraelectric phase, antiferroelectric, ferrielectric, and ferri-ionic states in CuInP2S6 nanoflakes. The states’ stability and/or metastability is determined by the minimum of the system free energy consisting of electrostatic energy, elastic energy, and a Landau-type four-well potential of the ferrielectric dipole polarization. The possibility to govern the transitions by strain and ionic screening can be useful for controlling the tunneling barrier in thin film devices based on CuInP2S6 nanoflakes. Also, we predict that the CuInP2S6 nanoflakes reveal features of the controllable negative capacitance effect, which make them attractive for advanced electronic devices, such as nano-capacitors and gate oxide nanomaterials with reduced heat dissipation

Title: Ferri-ionic Coupling in CuInP2S6 Nanoflakes: Polarization States and Controllable Negative Capacitance

Authors: Anna N. Morozovska, Sergei V. Kalinin, Eugene A. Eliseev, Svitlana Kopyl, Yulian M. Vysochanskii, and Dean R. Evans

Reference: arXiv:2405.14368 [physics.app-ph]

DOI: https://doi.org/10.48550/arXiv.2405.14368

Article 31 – Hysteresis phenomena in Cd2P2S6 layered crystals

2026-09-29

Abstract: The results of the study of the temperature dependence of the dielectric permittivity of Cd2P2S6 crystals are presented. It is shown that in the temperature range 80–420 K there are three regions in which hysteresis phenomena are observed. At high temperatures (T > 320 K) there is an activation change of the dielectric

Article 30 – The influence of electric field on the anisotropic dispersion of the flexocoupling induced phonons and ferrons in van der Waals ferrielectrics

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Abstract: As it has been shown recently, the influence of the flexoelectric coupling (shortly “flexocoupling”) on the fluctuations of electric polarization and elastic strains can lead to the principal changes of the dispersion law of soft optical and acoustic phonons (shortly “flexophonons”) and ferrons (shortly “flexoferrons”) in van der Waals

Article 29 – The impact of morphological structure and flexo-chemical strains on the electric transport mechanisms in molybdenum-disulfide-oxide nanoflakes

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Abstract: Electric conduction mechanisms in pressed powder samples consisting of molybdenum-disulfide-oxide (MoSxOy) nanoflakes depending on their content and structure have been investigated. The MoSxOy nanoflakes were synthesized in the temperature range of 130 °C–180 °C by reaction of (NH4)6Mo7O24 with thiourea in aqueous solution followed by aerial oxidation. The chemical

Article 28 – Osteogenic Differentiation Triggered by Intracellular Magnetoelectric Stimulation of Core–Shell Nanotransducers under Remotely Applied Magnetic Fields

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Abstract: Magnetoelectric nanoparticles (MENPs), combining a magnetostrictive core with a piezoelectric shell, offer a promising route for remote-controlled biomedical applications by converting external magnetic fields into electric cues. However, the clinical translation of these materials remains limited due to the toxicity of high-performance piezoelectric materials, which typically contain lead. Previously,

Article 27 – Colossal dielectric response of H⁡f𝑥⁡Z⁢r1−𝑥⁢O2 nanoparticles

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Abstract: We observed a colossal dielectric response of small (5–10 nm) oxygen-deficient H⁡f𝑥⁡Z⁢r1−𝑥⁢O2 nanoparticles (𝑥=1–0.4), prepared by solid-state organonitrate synthesis. The effective dielectric permittivity of the pressed H⁡f𝑥⁡Z⁢r1−𝑥⁢O2 nanopowders has a pronounced maximum at 38–88∘⁢C, the shape of which can be fitted by the Curie-Weiss type dependence modified for the

Article 26 – Wireless Magnetoelectric Stimulation Platform Orchestrating Multicellular Coupling in Complex Neurovascularized Tissue Regeneration

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Abstract: Bone regeneration is a well-orchestrated biological process involving coordinate efforts of multiple cells, cytokines, and signals, among which nerves play a dominant role in regulating osteogenesis. Draw inspiration from the inherent electroactive features of bone and nerve, bioelectric implant providing wireless delivery of electrical stimulation (ES), is an emerging

Article 4 – Ferri-ionic Coupling in CuInP2S6 Nanoflakes: Polarization States and Controllable Negative Capacitance

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Article 31 – Hysteresis phenomena in Cd2P2S6 layered crystals

Article 30 – The influence of electric field on the anisotropic dispersion of the flexocoupling induced phonons and ferrons in van der Waals ferrielectrics

Article 29 – The impact of morphological structure and flexo-chemical strains on the electric transport mechanisms in molybdenum-disulfide-oxide nanoflakes

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