The effect of {11}^B substitution on the superconductivity in MgCNi3

TL;DR

This study investigates how boron ({11}^B) substitution affects the crystal structure and superconducting transition temperature (Tc) of MgCNi3, revealing that boron doping slightly expands the lattice and reduces Tc.

Contribution

It provides detailed structural and superconducting property data for boron-doped MgCNi3, highlighting the solubility limit and the impact of boron on Tc.

Findings

Boron solubility limit is approximately x=0.16.

Lattice parameter increases with boron doping.

Tc decreases from 7.09K to 6.44K with boron substitution.

Abstract

The crystal structure of boron doped superconducting MgC_{1-x}{11}^B_{x}Ni_{3}, studied by powder neutron diffraction, is reported. The solubility limit of boron is determined to be approximately x=0.16. The unit cell expands from a = 3.81089(2) to 3.81966(2) Angstroms as x increases from x=0 to x=0.155. Boron ({11}^B) doping decreases Tc with increasing x: from 7.09K (x=0) to 6.44K (x=0.155).