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Author Zapata, C.; Nieva, G.; Ferreyra, J.M.; Villafuerte, M.; Lanoël, L.; Bridoux, G. doi  openurl
  Title The s-d exchange model as the underlying mechanism of magnetoresistance in ZnO doped with alkali metals Type Journal Article
  Year 2019 Publication Journal of Physics: Condensed Matter Abbreviated Journal Journal of Physics: Condensed Matter  
  Volume (down) 31 Issue 34 Pages 345801  
  Keywords  
  Abstract High field magnetoresistance has been studied in epitaxial n-type ZnO:Na and ZnO:Li thin films in a temperature range between 4 K and 150 K. The resulting negative magnetoresistance can be well fitted using a semiempirical model of Khosla and Fischer based on third order contributions to the s-d exchange Hamiltonian. The parameters obtained from this model were carefully analyzed. One of these parameters is related to a ratio between electron mobilities at zero field (a non-exchange scattering mobility and an exchange or spin dependent one ). From Hall effect measurements was obtained, displaying a weak temperature dependence in accordance with highly n-doped ZnO while the extracted exhibits an anomalous T-dependence. On the other hand, our magnetoresistance data cannot be properly fitted using Kawabata’s expression based on a weak-localization model.  
  Address  
  Corporate Author Thesis  
  Publisher IOP Publishing Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1361-648x ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 848  
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