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Author (up) Bridoux, G.; Villafuerte, M.; Ferreyra, J.M.; Guimpel, J.; Nieva, G.; Figueroa, C.A.; Straube, B.; Heluani, S.P. url  openurl
  Title Franz-Keldysh effect in epitaxial ZnO thin films Type Journal Article
  Year 2018 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Let.  
  Volume 112 Issue 9 Pages  
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  Notes Export Date: 14 March 2018 Approved no  
  Call Number BT @ jguimpel @ Serial 784  
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Author (up) Lanoël, L.; Rozas, G.; Bruchhausen, A.E.; Amigó, L.; Crivillero, M.V.A.; Hofer, J.A.; Villafuerte, M.; Bridoux, G.; Bengió, S.; Nieva, G. url  doi
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  Title Effects of aging processes at the surface of the superconductor β−FeSe Type Journal Article
  Year 2023 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 106 Issue Pages 214507  
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  Abstract This work reports a complete analysis of surface degradation in β−FeSe single crystals; which includes the dependence on aging and temperature of Raman spectra, electrical transport resistivity, and XPS depth profiling characterization. All measurements are consistent with the emergence of clusters of Se and the presence of FeOx in the surface of the crystals. The vibrational modes of the Se clusters are coupled to the β−FeSe ones as seen in the structural transition. Moreover, this degraded surface can behave like a quasi-two-dimensional layer, as supported by a theoretical model and also consistent with Raman spectra. While the degradation of thin films of β−FeSe in air is widely known, with a corresponding loss of the superconducting properties, in single crystals with aged surfaces we observe an enhancement of the superconducting properties.  
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  ISSN 2469-9950 ISBN Medium  
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  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 885  
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Author (up) 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  
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  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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  Publisher IOP Publishing Place of Publication Editor  
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  ISSN 1361-648x ISBN Medium  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 848  
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