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New Substituted Pyrochlore-Type Manganates with Magnetoresistive Properties

Published online by Cambridge University Press:  16 February 2011

W. Cheikh-Rouhou ,
R. Senis ,
C. Chaillout ,
P. Strobel ,
B. Martinez  and
X. Obradors
W. Cheikh-Rouhou
Affiliation:
Laboratoire de Cristallographie CNRS, BP166, 38042 Grenoble Cedex 9, France
R. Senis
Affiliation:
Instituto de Ciencia de Materiales de Barcelona, CSIC, Bellaterra 08193, Spain
C. Chaillout
Affiliation:
Laboratoire de Cristallographie CNRS, BP166, 38042 Grenoble Cedex 9, France
P. Strobel
Affiliation:
Laboratoire de Cristallographie CNRS, BP166, 38042 Grenoble Cedex 9, France
B. Martinez
Affiliation:
Instituto de Ciencia de Materiales de Barcelona, CSIC, Bellaterra 08193, Spain
X. Obradors
Affiliation:
Instituto de Ciencia de Materiales de Barcelona, CSIC, Bellaterra 08193, Spain
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 27
Copyright
Copyright © Materials Research Society 1999

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