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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 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.  
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  Corporate Author Thesis  
  Publisher IOP Publishing Place of Publication (up) 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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