Strontium Vacancy Effects upon the Physical Properties in Lacunar Pr0.7Sr0.3?x?xMnO3 Perovskite System

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We studied the structural, magnetic and electrical properties of lacunar perovskite-type manganese oxides Pr 0.7 Sr 0.3-x □ x MnO 3 , where 0 0.15. The resistivity of the samples increases with x. The sample Pr 0.7 Sr 0.2 □ 0.1 MnO 3 shows a ferromagnetic insulator behaviour below a spin-canted ferromagnetic temperature (T FC ).