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- W1599528089 abstract "Electronic transport in nickel magnetic point contacts is investigated with a combination of density functional theory and the non-equilibrium Green functions method. In particular we address the possibility of huge ballistic magnetoresistance in impurity-free point contacts and the effects of oxygen impurities. On-site corrections over the local spin density approximation (LSDA) for the exchange and correlation potential, namely the LDA+U method, are applied in order to account for low-coordination and strong correlations. We show that impurity-free point contacts present magnetoresistance never in excess of 50%. This value can raise up to about 450 % in the case of oxygen contamination. These results suggest that magnetoresistance in excess of 1,000 % can not have solely electronic origin." @default.
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- W1599528089 date "2007-01-22" @default.
- W1599528089 modified "2023-10-14" @default.
- W1599528089 title "Is magnetoresistance in excess of 1,000 % possible in Ni point contacts?" @default.
- W1599528089 doi "https://doi.org/10.48550/arxiv.cond-mat/0701512" @default.
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