Electromagnetic field penetration through lanthanum manganites |
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| Authors: | V V Ustinov A P Nossov A B Rinkevich V G Vasil’ev |
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| Institution: | (1) Institute of Metal Physics, Ural Division, Russian Academy of Sciences, Yekaterinburg, 620219, Russia;(2) Institute of Solid State Chemistry, Ural Division, Russian Academy of Sciences, Yekaterinburg, 620129, Russia |
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| Abstract: | The process of electromagnetic field penetration through lead-doped lanthanum manganites exhibiting colossal magnetoresistance has been studied. The measurements have been performed in a range of radio frequencies from 20 kHz to 10 MHz in the temperature interval containing a magnetic phase transition. Application of a constant external magnetic field leads to an increase in the transmission coefficient. Relative variations of the electromagnetic field transmission coefficient are several times as large as the relative change in the dc magnetoresistance. The temperature dependence of the relative change in the transmission coefficient has been studied. Variations of the transmission coefficient sharply decrease in the vicinity of the phase transition temperature, but they still remain rather large at temperatures above the Curie point. |
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