Weak localization and Mott state in two-dimensional Sr3V5S11.

Area of Science:

• Solid State Chemistry
• Materials Science
• Crystallography

Background:

• Layered materials offer unique electronic and magnetic properties.
• High-pressure synthesis enables access to novel crystal structures and phases.
• Vanadium sulfides are of interest due to their diverse electronic behaviors.

Purpose of the Study:

• To synthesize and characterize a new layered strontium vanadium sulfide compound.
• To investigate the crystal structure and physical properties of Sr3V5S11.
• To explore the potential for quasi-one-dimensional electronic behavior.

Main Methods:

• High-pressure and high-temperature synthesis (6 GPa, 1600 °C).
• Single-crystal X-ray diffraction for structural refinement.
• Magnetic susceptibility and electrical resistivity measurements.

Main Results:

• Successful synthesis of single crystals of Sr3V5S11.
• Determination of a monoclinic crystal structure (C2/c) with layered VS2 units and VS6 octahedra trimers.
• Observation of mixed vanadium valencies (V4+ and V3+) and quasi-1D V-V distances.
• Semiconducting-like electrical resistivity (room temperature ~1.2-10 mΩ cm) with a crossover to 1D variable range hopping at low temperatures.
• Magnetic susceptibility showing a large temperature-independent contribution and a Curie-Weiss term.

Conclusions:

• Sr3V5S11 is a novel layered compound with a unique crystal structure.
• The material exhibits characteristics of a correlated quasi-one-dimensional system.
• The observed electronic properties suggest potential for further research in low-dimensional materials.