Evolution of magnetic properties and canted spin behavior of the La0.7-xPrxPb0.3MnO3 manganite

Lance Horng, S. L. Young

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The colossal magnetoresistance (CMR) materials have attracted considerable attention recently. In this report, the results of detailed investigation of the structural and magnetic properties of the La0.7-xPrxPb0.3MnO3 (0 ≦ x ≦ 0.7) over a wide range of compositions are presented and compared with the consequences deduced from classical magnetic mechanism in this article. The regular replacement of smaller Pr ion in the La site causes structure change from rhombohedral symmetry with space group R3c to orthorhombic structure. Therefore, the introduction of praseodymium enhances the distortion of the perovskite, diminishes the spin-coupling exchange interaction, and decreases the ferromagnetic-paramagnetic transition temperature values from 332 K for x = 0 to 163 K for x = 0.7. For Pr-rich manganites, due to the canted spin of magnetic Pr ions, the magnetizations are hardly saturated under low field and the saturated moment are larger than that of the La-rich manganites under high field. The curves taken from FC-ZFC measurement indicated that the magnetic order changes from a ferromagnetic long-range order with x = 0.0 to a spin-glass nature with x = 0.7. These of regular substitution are in good agreement with increasing the B value in Bloch's T3/2 law, M(T)=Ms(0)(1-BT3/2), decreasing the spin-wave stiffness parameter D in quadratic dispersion relation, Ek = Dk2 and reducing the exchange energy Ek, as well as resulting in the lower value of Tc.

Original languageEnglish
Title of host publicationINTERMAG Europe 2002 - IEEE International Magnetics Conference
EditorsJ. Fidler, B. Hillebrands, C. Ross, D. Weller, L. Folks, E. Hill, M. Vazquez Villalabeitia, J. A. Bain, Jo De Boeck, R. Wood
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)0780373650, 9780780373655
DOIs
Publication statusPublished - 2002 Jan 1
Event2002 IEEE International Magnetics Conference, INTERMAG Europe 2002 - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2

Publication series

NameINTERMAG Europe 2002 - IEEE International Magnetics Conference

Other

Other2002 IEEE International Magnetics Conference, INTERMAG Europe 2002
CountryNetherlands
CityAmsterdam
Period02-04-2802-05-02

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Surfaces, Coatings and Films

Cite this

Horng, L., & Young, S. L. (2002). Evolution of magnetic properties and canted spin behavior of the La0.7-xPrxPb0.3MnO3 manganite. In J. Fidler, B. Hillebrands, C. Ross, D. Weller, L. Folks, E. Hill, M. Vazquez Villalabeitia, J. A. Bain, J. De Boeck, ... R. Wood (Eds.), INTERMAG Europe 2002 - IEEE International Magnetics Conference [1001343] (INTERMAG Europe 2002 - IEEE International Magnetics Conference). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INTMAG.2002.1001343