Origin of high transport spin polarization in La 0.7 Sr 0.3 MnO 3 : Direct evidence for minority spin states

By B. Nadgorny, I. Mazin, M. Osofsky, R. Soulen, Jr., P. Broussard, R. Stroud, D. Singh, Vincent G. Harris, A. Arsenov and 1 more. 2000

174 citations recorded by the source corpus.

Using the point-contact Andreev reflection technique, we have carried out a systematic study of the spin polarization in the colossal magnetoresistive manganite, ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ (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 transport half-metal.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/86355e4cdcdc4d371db8f6e16a50f5910c2ba5f8

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In Condensed Matter Physics

In Electronic, Optical and Magnetic Materials

In Materials Chemistry

Citations in the corpus

Half-metallic ferromagnets: From band structure to many-body effects (2007, methodology): “The experimental conformation of the HMF behavior by photoemission (Park et al., 1998), was contested on the basis of Andreev reflection measurements, that did show minority-spin d states at the Fermi energy (Nadgorny, 2007; Nadgorny et al., 2001).”
Spintronics: Fundamentals and applications (2004, unknown): “A large number of experimental results using spin-polarized Andreev reflection has since been reported (Bourgeois et al., 2001; Ji et al., 2001; Nadgorny et al., 2001; Parker et al., 2002; Panguluri, Tsoi, et al., 2003), including the first direct measurements (Braden et al.”