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Effects of spin-orbit coupling and s-d exchange interaction are probed bymagnetoresistance measurements carried out down to 50 mK on ZnO andZn_{1-x}Mn_{x}O with x = 3 and 7%. The films were obtained by laser ablationand doped with Al to electron concentration ~10^{20} cm^{-3}. A quantitativedescription of the data for ZnO:Al in terms of weak-localization theory makesit possible to determine the coupling constant \lambda_{so} = (4.4 +-0.4)*10^{-11} eVcm of the kp hamiltonian for the wurzite structure, H_{so} =\lambda_{so}*c(s x k). A complex and large magnetoresistance ofZn_{1-x}Mn_{x}O:Al is interpreted in terms of the influence of the s-dspin-splitting and magnetic polaron formation on the disorder-modifiedelectron-electron interactions. It is suggested that the proposed modelexplains the origin of magnetoresistance observed recently in many magneticoxide systems.Comment: 4 pages, 4 figure

physical review. b, condensed matter and materials physics

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Spin-related magnetoresistance ofn-type ZnO:Al andZn1−xMnxO