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Superconductivity in the Locally Noncentrosymmetric Th2Mo2Rh2Si4C by Rational Design.

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Researchers designed a new locally noncentrosymmetric (LNC) superconductor, Th₂Mo₂Rh₂Si₄C, exhibiting enhanced superconductivity. This material shows potential for studying exotic properties arising from broken inversion symmetry and spin-orbit coupling (SOC).

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Locally noncentrosymmetric (LNC) superconductors, lacking local inversion symmetry, can display unique phenomena due to antisymmetric spin-orbit coupling (SOC).
  • Constructing LNC superconductors often involves integrating LNC structural units into superconducting frameworks.

Purpose of the Study:

  • To design and synthesize a novel complex LNC superconductor.
  • To investigate the superconducting properties and underlying electronic structure of the new material.
  • To explore the interplay between superconductivity and Rashba-type SOC.

Main Methods:

  • Crystallographic design and synthesis of Th₂Mo₂Rh₂Si₄C.
  • Physical property measurements, including upper critical field (μ₀Hc₂(0)) and transition temperature (Tc).
  • First-principles calculations to analyze electronic structure and SOC effects.

Main Results:

  • Successful synthesis of Th₂Mo₂Rh₂Si₄C with a unique 22241* structure.
  • Observation of bulk superconductivity with Tc = 2.1 K and a significantly enhanced μ₀Hc₂(0) of 1.39 T.
  • Theoretical confirmation of Rashba-type SOC, leading to band splitting and gapped band crossings near the Fermi level.

Conclusions:

  • Th₂Mo₂Rh₂Si₄C is a promising new material for studying LNC superconductivity.
  • The enhanced upper critical field highlights the potential of this material design strategy.
  • This work offers a pathway for discovering new superconductors with exotic properties driven by broken inversion symmetry and SOC.