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Type: Artigo de evento
Title: Magneto-impedance Measurements In Bulk Samples Of La0.7ca 0.3mno3 And La0.6y0.1ca 0.3mno3
Author: Castro G.M.B.
Rodrigues A.R.
Machado F.L.A.
De Araujo A.E.P.
Jardim R.F.
Nigam A.K.
Abstract: In this work, magneto-resistance and magneto-impedance (MI) data for bulk samples of pure and Y-doped La0.7Ca0.3MnO3 manganites are reported. Temperature dependent measurements were carried out sweeping the applied magnetic field H in the -6T<H<6T range. The measurements were done with dc and ac electrical currents, varying the frequencies f up to 5MHz, using a four-probe technique. The pure La 0.7Ca0.3MnO3 sample presented a metal-insulator-transition near the ferromagnetic transition (TC = 245K). For these samples, magneto-resistance of the order 60% for H = 6T was observed close to TC. The substitution of ions of La by Y (La 0.6Y0.1Ca0.3MnO3) reduced T C to 170K but, on the other hand, increased the magneto-resistance to over 90% near TC. In the measurements with ac currents, the data for both samples presented a large magneto-impedance effect. The MI is more pronounced at high fields and for the Y-doped samples. Moreover, the Y-doped samples showed a strong hysteretic behavior that was not observed in the pure samples. © 2003 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2003.09.083
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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