Magnetism and Transport Properties of Sr2Ru1−xCoxO4 with x ≤ 0.25

Abstract

Single‐phase polycrystalline Sr2Ru1−xCoxO4 are successfully synthesized by conventional solid‐state method with doping content up to x = 0.25. Ferrimagnetism develops among the incommensurate antiferromagnetic fluctuations in the doped compounds. An abnormal coercivity–temperature relation at a high doping level (x > 0.10), in which the samples have smaller coercive field at low temperature than that at high temperature, i.e., HC(5 K) < HC(50 K), is observed. The Curie–Weiss temperature shows the negative value for all samples, and the susceptibility increases with Co doping content x. The exchange bias effect is detected in magnetic hysteresis loops. A three‐dimensional transport property has been derived based on the variable rang hopping theory, indicating a thermally assisted hopping of electrons between the localized states.