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New Substituted Pyrochlore-Type Manganates with Magnetoresistive Properties
Published online by Cambridge University Press: 16 February 2011
Abstract
Substitutions in the pyrochlore-type oxide Tl2Mn2O7 have been carried out on both the Mn and the TI site, using high pressure synthesis at 4-6 GPa. We show that a continuous solid solution exists between Tl2Mn2O7, and Tl2Ru2O7, and that the replacement of a fraction of Mn by Ru dramatically changes the transport properties from metallic to semiconducting and induces magnetoresistance (MR) in this system. MRs up to 95% (vs. RO) have been observed. The Tl site, already known to accept In or Sc, can also be substituted by the larger cation Bi3+, which also induces a metal-insulator transition at low substitution level.
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- Copyright © Materials Research Society 1999
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