Resonance Raman study of 2Δ-gap like features in superconducting BI-2212 and YBCO

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Erscheinungsjahr:
2006
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Text
Beschreibung:
  • We studied the variation of the 2Δ-gap like peaks with incident photon energy Ei in two superconducting samples, optimally doped YBCO (Tc=93.6 K) and overdoped Bi-2212 (Tc=82 K). Our results highlight the composite nature of the 2Δ-gap like peaks in the HTS. Below the superconducting Tc we see a redistribution of spectral weight and the appearance of the 2Δ-gap like features. In B1g Raman symmetry these features change their shape, peak position, and intensity with increasing Ei. For Ei∼3.5 eV we find little redistribution, only a strong new peak at a Raman frequency well above the accepted values of twice Δmax.
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  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH

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oai:www.edit.fis.uni-hamburg.de:publications/50c04c43-0602-4ee3-9f5d-0d20779cec2a