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The magnetic and magnetotransport properties of the Sr3Fe2-xCoxO7-d system(0.2 <= x <= 1.0) were systematically investigated. This oxide system exhibitsa giant magnetoresistance (GMR) effect at low temperatures, reaching up to 80%in 7 T at 5 K. Ac-susceptibility measurements show that there exists a strongcompetition between ferromagnetic (F) and spin glass states, and the balancebetween these two magnetic states can be controlled by varying cobalt (x)and/or oxygen contents (d). Importantly, the MR effect is closely related tothe magnetic property: the development of magnetic disordering leads toenhancement in the negative MR effect. It is suggested that the compoundsegregates into F clusters embedded in a non-F matrix, being a naturallyoccurring analog of the artificial granular-GMR materials, as in the dopedperovskite cobaltites, La1-xSrxCoO3 (x < 0.18).Comment: 31 pages, 10 figures, to appear in J. Phys.: Condens. Matte

journal of physics. condensed matter

Enhancement of giant magnetoresistance effect in the Ruddlesden–Popper phase Sr3Fe2−xCoxO7−δ: predominant role of oxygen nonstoichiometry and magnetic phase separation