The effect of Mn-site doping on the magnetotransport properties of CMR manganites: discussion

A. Maignan*, F. Damay, A. Barnabé, C. Martin, M. Hervieu, B. Raveau, Thom T.M. Palstra

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

62 Citations (Scopus)
13 Downloads (Pure)

Abstract

Doping of the Mn-site in Ln1-yAyMn1-xMxO3 manganites has been extensively investigated. For the manganites exhibiting a Curie temperature (TC) these substitutions depress TC. However, the effect on TC is doping-element dependent. It decreases from dTC/dx = -25 K %-1 for M = Fe down to dTC/dx ∼ 0 K %-1 for M = Cr in the series Sm0.56Sr0.44Mn1-xMxO3. The peculiar role of chromium doping is also shown in the case of the charge-ordered Ln0.5Ca0.5MnO3-substituted manganites that are characterized by low average cationic size on the A-site and cationic size mismatch. For the latter, metal-insulator transitions together with CMR properties are induced by Cr and to a smaller extent by Co and Ni. The hindering of the charge-ordering establishment by these 'impurity effects' is also observed in the case of the two-dimensional manganites La0.5Sr1.5MnO4 and LaSr2Mn2O7. The highest efficiency of Cr among all doping elements may be ascribed to the similar t3 2g electronic configurations of Cr3+ and Mn4+ which allow a double-exchange between the Cr3+ and Mn3+ species.

Original languageEnglish
Pages (from-to)1635-1659
Number of pages25
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume356
Issue number1742
DOIs
Publication statusPublished - 15 Jul 1998
Externally publishedYes

Keywords

  • Antiferromagnetism
  • Ferromagnetism
  • Insulator-metal
  • Magnetoresistance
  • Manganite
  • Mn-site doping

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