Increase in magnetoresistivity in Ba2CoS3viaZn2+/Co2+ substitution

Abstract

We report an increase of negative magnetoresistivity from 1.7% to 9% in the Ba₂Co_0.5Zn_0.5S₃ series (0 ≤x≤ 0.5), derived from Zn²⁺/Co²⁺ substitution in Ba₂CoS₃; Zn²⁺ substitution destroys the one-dimensional antiferromagnetic ordering typical of Ba₂CoS₃, in favour of a paramagnetic behaviour, and considerably increases the value of the resistivity, and to the best of our knowledge Ba₂Co_0.5Zn_0.5S₃ shows the most negative magnetoresistivity among the one-dimensional sulfides (MR ∼ 9%).