Physics – Condensed Matter – Materials Science
Scientific paper
2000-11-10
Phys. Rev. B, 63, 184433, 2001
Physics
Condensed Matter
Materials Science
6 pages, revtex, epsfigs embedded (two color figs)
Scientific paper
10.1103/PhysRevB.63.184433
Using the point contact Andreev reflection technique, we have carried out a systematic study of the spin polarization in the colossal magnetoresistive manganite, La$_{0.7}$Sr$_{0.3}$MnO$_{3}$} (LSMO). Surprisingly, we observed a significant increase in the current spin polarization with the residual resistivity. This counterintuitive trend can be understood as a transition from ballistic to diffusive transport in the contact. Our results strongly suggest that LSMO does have minority spin states at the Fermi level. However, since its current spin polarization is much higher than that of the density of states, this material can mimic the behavior of a true half-metal in transport experiments. Based on our results we call this material a {\it transport} half-metal.
Jr.
Arsenov A. A.
Broussard P.
Harris Vincent G.
Mazin Igor I.
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