Structure and paramagnetism in weakly correlated Y8Co5.

Area of Science:

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

Background:

• Understanding the physical properties of intermetallic compounds like Y8Co5 is crucial for exploring novel materials.
• The Y-Co binary system offers potential for diverse electronic and magnetic behaviors.
• Previous research may not have fully characterized the fundamental properties of Y8Co5.

Purpose of the Study:

• To determine the basic physical properties of monoclinic Y8Co5.
• To investigate the magnetic and electronic characteristics of Y8Co5.
• To assess the potential for superconductivity in Y8Co5 under high pressure.

Main Methods:

• Magnetic susceptibility, electrical resistivity, and specific heat measurements were employed.
• Synchrotron powder x-ray diffraction was used for crystal structure refinement.
• Band structure calculations using the full-potential linearized augmented plane wave (FP-LAPW) method were performed.

Main Results:

• Monoclinic Y8Co5 (space group P2(1)/c) was structurally characterized with precise lattice parameters.
• The compound exhibits temperature-independent paramagnetism (χ0 = 2.1 × 10⁻³ emu mol⁻¹) and a Sommerfeld parameter (γ = 63 mJ mol⁻² K⁻²).
• Low-temperature resistivity measurements up to 5.56 GPa showed no signs of superconductivity; band structure calculations yielded a Stoner parameter (S = 0.24), indicating non-magnetic behavior.

Conclusions:

• Y8Co5 is a non-magnetic, temperature-independent paramagnetic material with properties consistent with a free electron gas model.
• The compound does not exhibit superconductivity at low temperatures and high pressures.
• Theoretical calculations support the experimental findings of non-magnetic behavior in Y8Co5.