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Deciphering Short-Range Order in 2D Transition Metal Dichalcogenides: From Origin to Multi-Scale Property Modulation.

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Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary
This summary is machine-generated.

Chemical short-range order (SRO) in multi-principal element materials influences electronic properties. This study reveals SRO

Keywords:
chemical short‐range orderd‐band centermagnetic momentmid‐gap statetransition‐metal dichalcogenide

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Chemical short-range order (SRO) is a key structural feature in multi-principal element materials.
  • Its impact on site-resolved properties like magnetic moments and d-band centers is not well understood.
  • Understanding SRO is crucial for tuning material functionalities.

Purpose of the Study:

  • To investigate the origin and influence of chemical short-range order (SRO) in 2D ternary transition metal dichalcogenides (TMDCs).
  • To establish the relationship between SRO and site-resolved electronic and magnetic properties.
  • To identify descriptors for SRO formation and regimes of SRO influence.

Main Methods:

  • High-throughput first-principles calculations.
  • Machine learning models for descriptor identification.
  • Analysis of atomic arrangements and site-resolved properties.

Main Results:

  • Chemical affinity and atomic size difference are identified as dominant SRO descriptors.
  • Weak SRO in (V0.5Cr0.5)S2 minimally affects half-metallicity but modulates site-resolved magnetic moments and d-band centers.
  • Strong SRO in (Re0.5Ta0.5)S2 suppresses mid-gap states, leading to a semiconducting band gap.
  • The MACE-MP descriptor accurately maps local atomic arrangements to site-resolved properties.

Conclusions:

  • Chemical short-range order is a fundamental parameter for designing multi-scale material functionalities.
  • SRO significantly influences site-resolved properties even when global electronic properties remain largely unchanged.
  • The findings provide insights into controlling electronic and magnetic behavior in complex materials through SRO engineering.