Abstract
We investigate the magnetic and transport properties of polycrystalline bulk La0.225Pr0.4Ca0.375Mn1−xRuxO3 (x ≤ 0.15). With a slight Ru substitution of Mn, the Curie temperature of ferromagnetic transition is raised, the thermal hysteresis of resistivity is suppressed, and two metal-insulator transitions (MITs) coming from different mechanisms are observed. Furthermore, we observe that the resistivity of La0.225Pr0.4Ca0.375Mn1−xRuxO3 (0.01 ≤ x ≤ 0.1) increases abnormally with external electric field, and external magnetic field can suppress such abnormal electroresistance. These results suggest that the slight doping of Ru greatly suppresses the antiferromagnetic charge-ordered insulating (AFM/COI) phase. The Mn3+-Ru4+ ferromagnetic super-exchange and possible Ru4+-Ru4+ AFM interaction are implied to explain the observed behaviors.
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