Origins of both insulator-metal transition and colossal magnetoresistance in doped manganese perovskites

Yuan, S. L.; Yuan, S.L.; Zhao, W. Y.; Zhao, W.Y.; Zhang, G. Q.; Zhang, G.Q.; Tu, F.; Peng, G.; Liu, J.; Yang, Y. P.; Yang, Y.P.; Li, G.; Jiang, Y.; Zeng, X. Y.; Zeng, X.Y.; Tang, C. Q.; Tang, C.Q.; Jin, S. Z.; Jin, S.Z.
December 2000
Applied Physics Letters;12/25/2000, Vol. 77 Issue 26
Academic Journal
Based on experiments of both transport and paramagnetic resonance for (La[sub 1-x]Y[sub x])[sub 2/3]Ca[sub 1/3]MnO[sub 3], the ground state above T[sub c] and possible origins of both insulator-metal transition and colossal magnetoresistance near T[sub c] are discussed. Modeling the system as a network of junctions, each consisting of a paramagnetic region sandwiched between two ferromagnetic domains, a phenomenological expression is proposed for resistance as a function of temperature and magnetic field. We show that the observed transport and magnetotransport phenomena can be quantitatively explained by the present model for the whole temperature range studied. © 2000 American Institute of Physics.


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