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We compare the ac magnetotransport in two ferromagnetic metallic oxides, La 0.7 Sr 0.3 MO 3 (with M=Co and Mn) which show similar dc electrical properties. The ac resistance (R) and inductive reactance (X=ωL) of the complex impedance (Z=R+jX) are studied as a function of temperature at a few fixed frequencies (f=10kHz to 7 MHz) of the ac current excitation in zero and a low...
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