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Quasi-One-Dimensional Metallicity in Compressed CsSnI3.

Feng Ke1,2,3, Jiejuan Yan2, Roc Matheu4

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|December 19, 2022
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Applying pressure transforms insulating delta-cesium tin iodide (δ-CsSnI3) into a quasi-one-dimensional metal. This occurs due to distorted octahedral chains and enhanced tin-tin hybridization under high pressure.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Low-dimensional metal halides possess inherent structural and electronic anisotropies.
  • These properties make them promising for exploring novel electronic behaviors.
  • Understanding pressure effects is crucial for tuning material properties.

Purpose of the Study:

  • To investigate the pressure-induced electronic phase transition in δ-CsSnI3.
  • To elucidate the structural and electronic mechanisms behind metallicity.
  • To explore high-pressure synthesis of novel electronic materials.

Main Methods:

  • High-pressure experiments up to 40 GPa.
  • Synchrotron X-ray diffraction and Raman spectroscopy.
  • First-principles density functional theory calculations.

Main Results:

  • δ-CsSnI3 transitions from an insulator to a metal under pressure.
  • The quasi-one-dimensional chain structure of edge-sharing Sn-I octahedra is preserved.
  • Pressure induces Sn-Sn hybridization and enhances Sn-I coupling, closing the band gap.
  • Interchain interactions remain weak, leading to quasi-1D electronic anisotropy.

Conclusions:

  • Pressure effectively induces quasi-1D metallicity in δ-CsSnI3.
  • The observed metallicity arises from structural distortions and enhanced intra-chain bonding.
  • This work provides a high-pressure route to engineer electronic properties in metal halides.