2000/11/10 by B. Nadgorny, I. I. Mazin, M. Osofsky +14 · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Andreev reflection #Chemistry #Colossal magnetoresistance #Condensed matter physics #Electrical resistivity and conductivity #Electronic and Structural Properties of Oxides #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnetoresistance #Manganite #Materials science #Physics #Polarization (electrochemistry) #Quantum mechanics #Spin polarization #Superconductivity #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.63.184433
published as Phys. Rev. B, 63, 184433, 2001 · 6 pages, revtex, epsfigs embedded (two color figs)
arxiv created 2000/11/10 · openalex publication_date 2001/04/24 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using the point-contact Andreev reflection technique, we have carried out a systematic study of the spin polarization in the colossal magnetoresistive manganite, La0.7Sr0.3MnO3 (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.