Nonstoichiometry, Defects and Transport Properties in MgB2

Abstract

The local composition Mg:B of MgB2 powder was systematically changed through annealing. Correlations were observed between the Mg loss and the lattice parameters a/c and the microstrain of MgB2. Direct wavelength-dispersive-spectrum and XRD measurements on ceramic samples with different residual resistivity ratios suggested that the transport property of MgB2 might be affected by this Mg-deficiency, but oxygen-related defects may play a more important role.

9 pages, 10 figures, submitted to Phys. Rev. B (May 24, 2001)

References in corpus (3)

• Hole carrier in MgB_{2} characterized by Hall Measurements
• Effect of sintering temperature under high pressure in the uperconductivity for MgB2
• Correlation between the residual resistance ratio and magnetoresistance in MgB2

Cited by in corpus (6)

• Effects of Boron Purity, Mg Stoichiometry and Carbon Substitution on Properties of Polycrystalline MgB${}_2$
• High Pressure Effects on Superconductivity
• Influence of Mg deficiency in MgB2 single crystals on crystal structure and superconducting properties
• Microstructure and pinning properties of hexagonal-disc shaped single crystalline MgB2
• Effect of stoichiometry on oxygen incorporation in MgB2 thin films
• Heat capacity of mesoscopically disordered superconductors:implications to MgB${}_2$