[Zurück]

Z. Németh, Z. Klencsár, E. Kuzmann, Z. Homonnay, A. Vértes, J. Hakl, K. Vad, S. Mészáros, B. Lackner, K. Kellner, G. Gritzner, J. Grenèche, A. Lindbaum, S. De S.:
"The Role of Iron in the Enhancement of Negative Magnetoresistance in La_0.8Sr_0.2Fe_xCo_1-xO_3-z";
in: "INDUSTRIAL APPLICATIONS OF THE MÖSSBAUER EFFECT: International Symposium on the Industrial Applications of the Mössbauer Effect", AIP Conf. Proc. 765, 2005, S. 217 - 222.

The Role of Iron in the Enhancement of Negative Magnetoresistance in La_0.8Sr_0.2Fe_xCo_1-xO_3-z

Z. Németh,* Z. Klencsár,[dagger] E. Kuzmann,[dagger] Z. Homonnay,* A. Vértes,*,[dagger] J. Hakl,¶ K. Vad,¶ S. Mészáros,¶ B. Lackner,[double-dagger] K. Kellner,[double-dagger] G. Gritzner,[double-dagger] J. M. Grenèche,iams A. Lindbaum,lubs and S. K. Depades

*Department of Nuclear Chemistry, Eötvös Loránd University, Pázmány P. s. 1/a, Budapest 1117, Hungary
[dagger]Research Group for Nuclear Methods in Structural Chemistry, Hungarian Academy of Sciences
¶Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, POB 51, Hungary
[double-dagger]Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University, Altenbergerstraße 69, A-4040 Linz, Austria
iams Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087 Université du Maine, 72085 Le Mans Cedex 9, France
lubs Institute for Experimental Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10/131, A-1040 Wien, Austria
pades Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Calcutta, 700032, India

The role of iron in enhancing the magnetoresistance in the compounds La_0.8Sr_0.2Fe_xCo_1-xO_3-z was investigated by studying the electronic and magnetic structure of La_0.8Sr_0.2Fe_xCo_1-xO_3-zas a function of temperature. For this purpose ⁵⁷Fe transmission Mössbauer spectroscopy, magnetoresistance, as well as AC and DC magnetization measurements were applied. The detailed study of the temperature dependence of ⁵⁷Fe Mössbauer parameters gave possibility to explore correlations between the local electronic and magnetic state of iron and the magnetic susceptibility as well as magnetoresistance in La_0.8Sr_0.2Fe_xCo_1-xO_3-z. On the basis of the obtained results an attempt was made to explain the exotic magnetic and MR properties of these perovskites.

http://dx.doi.org/10.1063/1.1923658