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- W2006076725 abstract "Through high-pressure (HP) annealing, a large enhancement of the magnetoresistance (MR) has been achieved for polycrystalline La0.7Sr0.3MnO3 samples over a wide range of temperature at low applied magnetic fields. Moreover, the HP-annealed samples exhibit much lower resistivity and higher metal-insulator transition temperatures. Interestingly, the low-field MR (LFMR*) values at 5K of such HP-annealed samples are found to reach as high as 45%, significantly exceeding a theoretical upper limit of 33% based on the second-order tunneling through interfacial spin sites for the polycrystalline manganese oxides. We attribute the enhanced LFMR* to the effect of HP annealing that makes the grain boundary thinner and thus allows a large fraction of eg electrons tunnel directly across the grain boundary rather than by a two-step hop process." @default.
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- W2006076725 date "2005-08-01" @default.
- W2006076725 modified "2023-09-24" @default.
- W2006076725 title "Effect of high-pressure annealing on magnetoresistance in manganese perovskites" @default.
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- W2006076725 doi "https://doi.org/10.1063/1.1999832" @default.
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