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Transport and magnetic properties of Fe substituted manganites

M. L. CRAUS1,2, M. LOZOVAN1,* , N. CORNEI3, C. MITA3

Affiliation

  1. National Institute of Research & Development for Technical Physics, Iassy, Romania
  2. Joint Institute for Nuclear Research, Dubna, Russia
  3. ”Al. I. Cuza” University, Iassy, Romania

Abstract

Magnetic perovskites with ABO3 structure have interesting properties, due their complex electronic phase diagram, which depend on chemical composition, average radius of A places and chemical disorder degree. We have obtained a new type of manganites, with La0.54Ho0.11(Ca, Sr)0.35Mn1-xFexO3 chemical composition, were obtained by sol-gel method. XRD analysis was performed with at room temperature with a diffractometer previewed with a data acquisition system, data being handled with a Rietveld type program. The samples contain only an orthorhombic phase, identified as Pnma, GS 62. Lattice constants, unit cell volume and the atomic positions in the unit cell were determined. Mn-O distances and Mn-O-Mn angles were calculated and a correlation with the observed Curie temperatures was put in evidence. The magnetic measurements were performed between 77 and 300 K with a Foner type magnetometer. Electric measurements were performed by means of four probes method, between 7 and 300 K. Large values of magnetoresistance were obtained for samples with Sr..

Keywords

Manganites, Transport properties, Magnetic properties, Magnetoresistance.

Submitted at: Sept. 25, 2007
Accepted at: Feb. 18, 2008

Citation

M. L. CRAUS, M. LOZOVAN, N. CORNEI, C. MITA, Transport and magnetic properties of Fe substituted manganites, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 2, pp. 269-272 (2008)