Large enhancement of magnetoresistance in Tl2Mn2O7: Pyrochlore versus perovskite

  • Ramirez A
  • Subramanian M
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Abstract

The synthesis of and magneto-transport in the ''colossal magnetoresistance'' (CMR) pyrochlore-structure compounds Tl2-xScxMn2O7 for 0 less than or equal to less than or equal to 0.5 are reported. The maximum resistivity (rho) increases by 10(5) while the Curie temperature (T-c) decreases by only 25% between x = 0 and 0.4. For x = 0.2 to 0.3, the magnetoresistance at both high field (6 tesla) and low field (

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