Nickel-based oxyphosphide superconductor with a layered crystal structure, LaNiOP.

Area of Science:

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

Background:

• Layered oxyphosphides represent a class of materials with potential for novel electronic properties.
• Understanding the structure-property relationships in these compounds is crucial for discovering new functional materials.

Purpose of the Study:

• To synthesize and characterize a novel layered oxyphosphide, LaNiOP.
• To investigate the superconducting properties of LaNiOP.
• To determine if LaNiOP is a bulk superconductor.

Main Methods:

• Solid-state reaction synthesis of LaNiOP.
• X-ray diffraction for structural analysis.
• Electrical resistivity measurements.
• Magnetic susceptibility measurements.

Main Results:

• LaNiOP was successfully synthesized with a layered structure, alternating (La(3+)O(2-))(+) and (Ni(2+)P(3-))(-) layers.
• Superconducting transition observed at approximately 3 K, indicated by a sharp drop in resistivity to zero.
• Metallic conduction and Pauli paramagnetism observed between 4-300 K.
• Negative magnetic susceptibility below 4 K confirmed superconductivity.
• Volume fraction of the superconducting phase estimated at approximately 40 vol % at 1.8 K.

Conclusions:

• LaNiOP is a newly discovered layered oxyphosphide superconductor.
• The material exhibits bulk superconductivity, as evidenced by its superconducting transition and significant superconducting volume fraction.
• LaNiOP presents a new platform for research into the mechanisms of superconductivity in layered materials.