Abstract
Magnetoresistance measurements have been carried out on single-crystal sample of the transition-metal Zintl compound Eu14MnSb11. Eu14MnSb11 is the first compound of the Ca14-AlSb11 structure type in which magnetoresistive effects have been measured. Colossal magnetoresistance (CMR) at 92 K and 5 T with Δρ/ρ(0) = -36% and at 5 K and 5 T with Δρ/ρ(0) = -42% were observed. CMR is observed at the ferromagnetic-paramagnetic phase transition (92 K). A large negative magnetoresistance is observed below the second magnetic transition (15 K) and is attributed to a field-induced antiferromagnetic-ferromagnetic ordering of the Eu2+ lattice. The MR is highly anisotropic with respect to the crystallographic axes. A sign change in the curvatures of ρ(H) curves below and above 92 K has been observed, indicating that two different mechanisms are responsible for the magnetic scattering of the carriers in two separate temperature regions.
Original language | English (US) |
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Pages (from-to) | 3132-3135 |
Number of pages | 4 |
Journal | Chemistry of Materials |
Volume | 9 |
Issue number | 12 |
State | Published - Dec 1997 |
ASJC Scopus subject areas
- Materials Science(all)
- Materials Chemistry