Fig. 5.
Phenomenological uniaxial anisotropy model for the AMR of La0.69Ca0.31MnO3. (A) Calculated normalized resistivity at a given temperature as a function of magnetic field strength and orientation with respect to the crystal c-axis (Θ), based upon the uniaxial anisotropic model (see the Inset for the uniaxial resistivity ellipsoid). (B) Calculated (solid lines) Θ-dependence of normalized resistivity for three values of fields (corresponding to the three sheets in A) rotating in the yz plane, compared with the experimental results (symbols) measured from the slab sample at T = 225 K. (C and D) Calculated angle dependence of normalized resistivity for a field of H = 1.0 T rotating in three perpendicular planes (from y to x, z to y, and z to x direction), compared with the experimental results (symbols) measured at T = 225 K from the slab (see Fig. 1) and square-rod (see Fig. 4.) sample, respectively.