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Author Bahrs, S.; Reich, S.; Zwick, A.; Goni, A.R.; Bacsa, W.; Nieva, G.; Thomsen, C. openurl 
  Title Raman spectroscopy with UV excitation on untwinned single crystals of YBa2Cu3O7-delta Type Journal Article
  Year 2004 Publication PHYSICA STATUS SOLIDI B-BASIC RESEARCH Abbreviated Journal  
  Volume 241 Issue 12 Pages R63-R66  
  Keywords  
  Abstract (up) Recent reflectance anisotropy studies on the material showed a photobleaching effect in the in-plane components of the dielectric function around 2.2 and 4.1 eV [1]. We present Raman spectra of oxygen deficient YBa2Cu3O7-delta detwinned single crystals taken with laser excitation of 3.7 eV, close to the UV feature in the dielectric function, in search for a signal from the defect-induced Raman modes. While two groups of defect-induced mode at 230 cm(-1) and 600 cm(-1) behave very similar at the 2.2 eV resonance, we find clear differences for UV excitation. A peak at 600 cm(-1) is identified as a copper-oxygen-chain related, defect-induced modes by its Raman selection rules. While this mode is enhanced beyond the strength of the Raman-allowed modes, the group at 230 cm(-1) is absent. Low temperature experiments showed no change of the peak height under illumination, though the peaks are known to photobleach in the visible. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.  
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  Series Volume Series Issue Edition  
  ISSN 0370-1972 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000224488800005 Approved no  
  Call Number BT @ hernan @ Serial 205  
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