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Magnetotransport Behavior and the Phase Diagram of Nd _{1 - {\rm x}} Ca _{\rm x} MnO _{3} Manganites

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4 Author(s)
Hsu, Daniel ; Center for Condensed Matter Sci., Nat. Taiwan Univ., Taipei, Taiwan ; Shih, Y.C. ; Wang, W.T. ; Lin, J.G.

In this work, the temperature dependent magnetization M(T) and the electrical resistivity rho (T) of Nd1-xCaxMnO3 (x=0.1-0.5) are measured. From the M(T) curves, the ferromagnetic (FM) phase is observed for samples of x=0.1 and 0.2. However, the canted-antiferromagnetic (CAF) phase which coexists with the charge-ordering (CO) phase occurs at low temperature for samples x=0.3-0.5. By systematically changing the Ca concentration from x=0.1 to 0.5, a detailed phase diagram is established. Based on the result of magnetic field dependent rho (T), the magnetoresistance ratio is calculated, which shows a maximum in the x=0.4 sample. These results are helpful for improving the MR effect in these manganites.

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Magnetics, IEEE Transactions on  (Volume:45 ,  Issue: 10 )