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Competing A‐site and B‐site doping effects on magneto‐transport of RE 0.55 Sr 0.45 Mn 1− x Ru x O 3 manganites in the vicinity of the SGI and FMM border
Author(s) -
Alagoz H. S.,
Živković I.,
Mahmud S. T.,
Saber M. M.,
Perrin G.,
Shandro J.,
Khan M.,
Zhang Y.,
Egilmez M.,
Jung J.,
Chow K. H.
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201350013
Subject(s) - doping , percolation threshold , percolation (cognitive psychology) , condensed matter physics , ferromagnetism , materials science , transition metal , electrical resistivity and conductivity , crystallography , analytical chemistry (journal) , chemistry , physics , catalysis , biochemistry , quantum mechanics , chromatography , neuroscience , biology
Competing effects of the A—site and B—site doping on the magneto—transport have been investigated in RE 0.55 Sr 0.45 Mn 1−x Ru x O 3 (0 ≤ x ≤ 0.25) manganites with RE (A—site) = Gd y Sm 1−y (0 ≤ y ≤ 1). The Ru (B—site)‐free system is a ferromagnetic metal (FMM) for y ≤ 0.5 and a spin—glass insulator (SGI) for y > 0.5. For y ≤ 0.5, Ru improves the metallicity compared to the Ru—undoped system. For y > 0.5, Ru—doping induces a transition from the SGI to FMM state, above a percolation threshold which depends strongly on the A—site substitution. Interestingly, irrespective of the A—site doping level y , the percolation is suppressed when the Ru concentration x exceeds ∼16% to 18%.