Author/Authors :
Yuan، نويسنده , , S.L. and Zhao، نويسنده , , Z.Y. and Xia، نويسنده , , Z.C. and Liu، نويسنده , , L. and Zhang، نويسنده , , G.H. and Tang، نويسنده , , J. and Zhang، نويسنده , , L.J. and Feng، نويسنده , , W. and Chen، نويسنده , , W. and Zhao، نويسنده , , L.F. and Liu، نويسنده , , S.، نويسنده ,
Abstract :
A systematic investigation of magnetic and transport properties is carried out for La2/3Ca1/3MnO3 polycrystalline sample with the average grain size ∼300 nm. Experimental results are discussed in terms of spin-polarized tunnelling model. It is shown that although the resistivity ρ(T,H) is related to the magnetization M(T,H), the variation in M(T,H) does not exactly track ρ(T,H). A possible interpretation is presented by considering the alignment of Mn spins within grains and the magnetic coupling of neighboring grains.
