Control of antisite disorder, magnetism, and asymmetric doping effects in (La1+xCa1-x)CoRuO6 double perovskites

Jan-Willem G Bos, J Paul Attfield

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Abstract

The structures, magnetism, and electronic transport properties of the semiconducting (La1+xCa1-x)CoRuO6 double perovskites (-0.25<x<0.25) have been investigated. Lattice parameters, antisite disorder, the Neel temperature and resistivities are found to vary in a systematic manner with x. The Co-Ru antisite disorder is minimal at x=0, showing that this disorder is driven by the mixed Co or Ru electronic states at \x\not equal0 rather than by La/Ca cation mixing. Hole doping (x<0) decreases the resistivity by two orders of magnitude without significantly changing the magnetization, whereas electron doping (x>0) enhances the magnetization with little change to the resistivity, perhaps signaling the formation of magnetic clusters. LaCaCoRuO6 orders antiferromagnetically at T-N=96 K, accompanied by a magnetostrictive anomaly. The Co/Ru spin structure, with a magnetic vector k=(1/2,0,1/2), cannot be determined unambiguously from neutron powder diffraction data.

Original languageEnglish
Article number094434
Number of pages6
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume69
Issue number9
DOIs
Publication statusPublished - 1 Mar 2004

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