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Ferromagnetic-antiferromagnetic transition and resistivity variation of oxygen-deficient La 0.5 Ca 0.5 MnO 3 samples

We have investigated the influence of oxygen vacancies on electronic transport and magnetic property of polycrystalline bulk La 0.5 Ca 0.5 MnO 3 （LCMO）. With increasing content of oxygen vacancy, its resistivity at high temperature increases monotonically and follows the adiabatic small-polaron model. The resistivity at low temperature first deereases, then increases, and has the behavior of d R /d T >0 evidently. The resistivity at low temperature becomes insulating at last. Increasing the oxygen vacancies depresses the appearance of antiferromagnetic phase. As a result, antiferromagnetic transition does not occurs in oxygen-deficient LCMO samples. On more increasc of oxygen vacancies, ferromagnetic phase will eventually be suppressed.