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Temperature, magnetic induction and substitution dependent resistivity are acrucial factor in determining the physical properties of magneto-resistivematerials. The first objective of this work was to find out an applicablemethod of using temperature to predict the resistivity ofPr0.7(CaxSr1-x)0.3MnO3 in the metal phase within the transition area. Based onnon-linear curve fitting, a typical numerical method is used to quantitativelyanalyze the temperature-dependent resistivity within temperatures lower thanthe metal-insulator transition temperature (Tp). The simulations agree verywell with the observed curves (resistivity versus temperature). The secondobjective of this work is to search for the applicable method to linkmagneto-resistivity to magnetic induction, calculation on the principle ofnon-linear curve fitting, four typical numerical methods are highlightedbecause the magnetic induction-dependent magneto-resistivity are quantitativelyanalyzed by these methods. The observed effects of magnetic induction on theshift of temperature-resistive curve should be more essential in physics andare quantitatively discussed in magneto-resistive materials. Lastly, theinfluences of Ca substitution on magneto-resistivity are detected.

Systematic comprehension the metal phase of Pr0.7(CaxSr1-x)0.3MnO3 via temperature and magnetic induction