Magnetoresistance in Mn pyrochlore: electrical transport in a low carrier density ferromagnet

Details Magnetoresistance in Mn pyrochlore: electrical transport in a low carrier density ferromagnet Magnetoresistance in Mn pyrochlore: electrical transport in a low carrier density ferromagnet

1997-08-08

arxiv.org/abs/cond-mat/9708068v1

Physics

Condensed Matter

Materials Science

4 pages, LaTex, + 3 figures

Scientific paper

10.1103/PhysRevLett.81.1314

We discuss magnetotransport in a low density electron gas coupled to spin fluctuations near and above a ferromagnetic transition. Provided the density is low enough ($n \lesssim 1/\xi^{3}(T)$, with $\xi(T)$ the ferromagnetic correlation length), spin polarons form in an intermediate temperature regime above $T_c$. Both in the spin polaron regime, and in the itinerant regime nearer $T_c$, the magnetoresistance is large. We propose that this provides a good model for ``colossal'' magnetoresistance in the pyrochlore Tl$_{2-x}$Sc$_x$Mn$_2$O$_7$, fundamentally different from the mechanism in the perovskite manganites such as La$_{1-x}$Sr$_x$MnO$_3$.

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