A New ZrCuSiAs-Type Superconductor: ThFeAsN.

Area of Science:

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

Background:

• Iron-pnictide superconductors are a critical class of materials exhibiting unique electronic properties.
• The exploration of novel compositions is essential for advancing superconductor technology.
• Nitrogen incorporation in superconductors remains an underexplored area.

Purpose of the Study:

• To synthesize and characterize a new nitrogen-containing iron-pnictide superconductor.
• To investigate the superconducting properties of the newly discovered compound.
• To determine the crystal structure and lattice parameters of ThFeAsN.

Main Methods:

• Solid-state reaction in an evacuated container for synthesis.
• X-ray diffraction for crystal structure determination (ZrCuSiAs-type, P4/nmm space group).
• Electrical resistivity and DC magnetic susceptibility measurements to detect superconductivity.

Main Results:

• Successful synthesis of the nitrogen-containing iron-pnictide superconductor ThFeAsN.
• Determination of crystal structure with lattice parameters a = 4.0367(1) Å and c = 8.5262(2) Å at 300 K.
• Observation of superconductivity at a critical temperature (Tc) of 30 K in nominally undoped ThFeAsN.

Conclusions:

• ThFeAsN represents the first reported nitrogen-containing iron-pnictide superconductor.
• The discovery expands the family of known superconductors and highlights the potential of nitrogen doping.
• Further research into ThFeAsN could lead to a deeper understanding of superconductivity mechanisms.