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Phase Stability, Structural and Magnetic Properties of Some CMR Manganites

  • R. Ganguly
  • I. K. Gopalakrishnan
  • V. Siruguri
  • J. V. Yakhmi
Chapter
Part of the Lecture Notes in Physics book series (LNP, volume 593)

Abstract

Discoveries of colossal magneto-resistance (CMR) in the perovskite manganites, Ln1−x AxMnO3 (Ln = La, rare earth; A = divalent ions), as well as in the layered manganites, (La,Sr)3Mn2O7, has created a renewed interest in them. Their physical characteristics point to the existence of a fine interplay between spin, charge and lattice interactions. Substitutional studies, particularly at the rare earth and Mn sites in these compounds, can throw light on important crystal chemical aspects. Through systematic site-selective substitutions we have tried to evaluate the phase stability of some of these layered and perovskite manganites. In particular, our study on the layered manganites, La1.2(Sr1−x Cax)1.8Mn2O7, and Ca3−x LaxMn2O7, establishes that the compositions Ca3–x LaxMn2O7 (1.2 ≤ x ≤ 2.3) do not form layered compounds with Sr3Ti2O7 - structure, in contrast to literature reports. Instead, they form multiphase mixtures with La1−x CaxMnO3 as the majority phases which, in fact, determine their magnetic and transport behavior. By careful structural and magnetic studies on La0.7Ce0.3MnO3 and La0.7MnO3 we have also proved that the compositions La1−x CexMnO3 do not form electron-doped manganites, but actually yield multiphase mixtures comprising La1−x MnO3 and CeO2. Lastly, we demonstrate that both Co and Cr as dopant ions destabilize the double-exchange mechanism driven ferromagnetism and metallic characters in La0.67Ca0.33Mn1−x CoxO3 and La0.67Ca0.33Mn1−y CryO3, and highlight the differences in the nature of the magnetic exchange interaction of Mn ions with Co, and with Cr ions in these hole-doped perovskite manganites.

Keywords

Domain Wall Perovskite Phase Perovskite Manganite Multiphase Mixture Double Exchange Interaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • R. Ganguly
    • 1
  • I. K. Gopalakrishnan
    • 1
  • V. Siruguri
    • 2
  • J. V. Yakhmi
    • 3
  1. 1.Novel Materials and Structural Chemistry DivisionBhabha Atomic Research CentreMumbaiIndia
  2. 2.Mumbai Centre, Bhabha Atomic Research CentreInter University Consortium for DAE FacilitiesMumbaiIndia
  3. 3.Technical Physics and Prototype Engineering DivisionBhabha Atomic Research CentreMumbaiIndia

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