2003/04/18 by John Androulakis, J. Androulakis, Androulakis, J. +6
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0304423
26 pages, 5 figures, 1 Table, pdf format
openalex publication_date 2003/04/18 · arxiv created 2003/12/29 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A detailed study of the zero-field electrical resistivity and magnetoresistance for the metallic members of the LaNi1-xCoxO3 solid solution with 0.3<=x<=0.6 is reported. The low temperature resistivity of the compounds with 0.3<=x<=0.5 exhibits a logarithmic dependence that is characteristic of systems with spin fluctuations. It is suggested that the effect of the magnetic field dependence on the spin fluctuations plays a vital role in determining the magnetoresistive behavior of these compounds. Concrete experimental evidence that classify the chemically induced metal-to-insulator transition (xc=0.65) as a percolative phenomenon is provided. The resistivity data for the x=0.6 metallic compound are analyzed in the framework of cluster percolation threshold theory. The results of this analysis are consistent with the suggestion that the growth of magnetic metallic clusters in the presence of a magnetic field is mainly responsible for the observed giant magnetoresistance effect at low temperatures for the compounds with x>=0.6.