Hg Substitution Effect on Superconductivity and Crystal Structure of MgB_2

• 出 处: Journal of Electronic Science and Technology of China
• 发表日期: 2008年02期
• 关键词: substitution suppression doping suppressed impurity attributed constants boron m

Polycrystalline Mg1-xHgxB2 samples with x=0, 1%, 2.5%, 5%, 7.5%, and 10% have been synthesized by solid-state reaction. Different from the substitution effect of Al, C, Li, etc. on crystal structure of MgB2, Hg substitution for Mg results in an increase of the lattice constant in both a and c directions. The superconductivity of MgB2 is also suppressed by Hg substitution. The observed suppression of superconductivity by Hg substitution is discussed in terms of the interband imp u rity scattering effect in two-band superconductors.

Polycrystalline Mg1-xHgxB2 samples with x = 0, 1%, 2.5%, 5%, 7.5%, and 10% have been synthesized by solid-state reaction. Different from the substitution effect of Al, C, Li, etc. on crystal structure of MgB2, Hg substitution for Mg results in an increase of the lattice constant in both a and c directions. The superconductivity of MgB2 is also suppressed by Hg substitution. The observed suppression of superconductivity by Hg substitution is discussed in terms of the interband imp u rity scattering effect in two-band superconductors.