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EFFECTS OF In DOPING INVESTIGATED BY ESR IN COLOSSAL MAGNETORESISTIVE MANGANITE La2/3Ca1/3MnO3

O. Raita1, M. N. Grecu2, X. Filip1, Al. Darabont3, D. Gavre1, J. Blasco4, L. V. Giurgiu1,*

Affiliation

  1. National Institute for Research & Development of Isotopic and Molecular Technologies P. O. Box 700, 3400 Cluj-Napoca, Romania
  2. National Institute of Materials Physics, P. O. Box MG-7, 76900 Bucharest, Romania
  3. Faculty of Physics, Babes-Bolyai University, 3400 Cluj-Napoca, Romania
  4. Departamento de Fisica de la Materia Condensada, Universidad de Zaragoza, 50009 – Zaragoza, Spain

Abstract

The effects of the substitution for Mn with In in the colossal magnetoresistive manganites La2/3Ca1/3Mn1-xInxO3 (x £ 0.05) have been investigated by ESR. The temperature and x dependence of the resonance linewidth have been investigated and discussed in terms of the spin–spin (exchange) interaction scenario. In the paramagnetic regime, the exchange coupling integral, J, between Mn3+and Mn4+ spins shows a decrease with increasing x. It could arise from the weakening of the double - exchange interaction upon doping, which reduces the exchange field at the Mn sites. The high temperature limit of the ESR linewidth does not depend on the doping level..

Keywords

Colossal magnetoresistive manganite, ESR, Indium doping, La-Ca-Mn-O.

Submitted at: July 29, 2002
Accepted at: March 12, 2003

Citation

O. Raita, M. N. Grecu, X. Filip, Al. Darabont, D. Gavre, J. Blasco, L. V. Giurgiu, EFFECTS OF In DOPING INVESTIGATED BY ESR IN COLOSSAL MAGNETORESISTIVE MANGANITE La2/3Ca1/3MnO3, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 289-292 (2003)