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Non-percolating small metallic clusters and sharp suppression of metallicity in RE0.55Sr0.45Mn1-xRuxO3 manganites
H S Alagoz1, I Živković, K H Chow
1Department of Physics, University of Alberta, Edmonton, AB T6G 2E1, Canada. alagoz@ualberta.ca.
Abstract:
The origin of the anomalous sharp phase transition from a ferromagnetic metal into a ferromagnetic insulator has been investigated in ruthenium (Ru)-doped RE0.55Sr0.45Mn1-xRuxO3 (0 ≤ x ≤ 0.25) manganites (RESRMO) with RE(A-site) = Sm, Eu and Gd. The transition is independent of RE and occurs at a Ru doping level x of around 0.16-0.18. The analysis of the temperature derivative of the resistivity and the magneto-resistance at high temperatures as a function of x suggests that the suppression of metallicity originates from the doping driven magnetic/spin disorder that coexist within the ferromagnetic metallic/insulating matrix in these compounds.
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