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Author (up) Bahrs, S.; Guimpel, J.; Goni, A.R.; Maiorov, B.; Fainstein, A.; Nieva, G.; Thomsen, C. openurl 
  Title Persistent photo-excitation in GdBa2Cu3O6.5 in a simultaneous Raman and electrical-transport experiment Type Journal Article
  Year 2005 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 72 Issue 14 Pages 144501  
  Keywords  
  Abstract We investigate the connection between persistent illumination-induced effects in underdoped RBa2Cu3O7-delta known as persistent photoconductivity and Raman bleaching. Despite the long-standing assumption that the electrical and optical properties respond to the same light-induced change in the material, they have not been directly compared until now. We present a simultaneous experiment of Raman spectroscopy and electrical transport under visible illumination at low temperatures. The time dependence of the response in the two methods differs by two orders of magnitude, showing that the effects are connected but not identical. We discuss our results within the oxygen-vacancy reordering model of photobleaching and find that different Cu-O chain lengths affect the optical and the electrical response differently. Raman bleaching and persistent photoconductivity thus provide a different perspective on the microscopic oxygen vacancy distribution.  
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  Language Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN 1098-0121 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000232934100060 Approved no  
  Call Number BT @ hernan @ Serial 204  
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