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We have studied the room-temperature magnetoimpedance of paramagnetic (x =0.06) and ferromagnetic (x = 0.1) samples in La0.7Ca0.3-xSrxMnO3 series using aradio-frequency impedance analyzer and also microwave power absorption using anetwork analyzer. In both measurements, samples were enclosed tightly inside acopper stripcoil and impedance or reflection coefficient of this copperstripcoil was measured as a function of the applied magnetic field fordifferent frequencies of current (f = 0.1 to 2.5 GHz). The direction of theapplied magnetic field was perpendicular to the alternating magnetic fieldproduced by the coil. In the ferromagnetic sample (x = 0.1), magnetoresistanceshows a peak around zero field for lower frequencies but a peak appears at Haway from the origin at higher frequencies. The position of the peak shiftstowards higher fields with increasing frequency. A similar trend is also foundfor the paramagnetic sample (x = 0.06) but the peak occurs at a higher fieldcompared to the ferromagnetic sample for the same frequency. Microwave powerabsorption also shows features similar to magnetoresistance. Line shapeanalysis of the data was performed by fitting the data to a Lorentzianfunction. It is concluded that the observed features are imprints offerromagnetic resonance in x = 0.1 and paramagnetic resonance in x = 0.06samples.

Broadband Magnetoresistance in Ferromagnetic and Paramagnetic Samples of La0.7Ca0.3-xSrxMnO3