Spin and charge excitations in optimally doped Bi2Sr2CaCU2O8a−δ

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Erscheinungsjahr:
1998
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Text
Beschreibung:
  • We present Raman spectra of low and high-energy charge and spin excitations in Bi2Sr2CaCu2O8−δ single crystals with an optimized critical temperature of 95 K. The prominent feature of the high-energy background at around 250 meV is a rearrangement of spectral weight in B1g and A1g+B2g symmetry below the critical temperature, similar to the observations in underdoped and optimally doped Y-123 compounds. In the low-energy region, which is influenced by the effects at higher energies, a gap feature in B1g symmetry is observed yielding a value for the magnitude of the superconducting order parameter of A=34 meV. This gap feature is influenced by the orthorhombicity of the crystals and except for a small loss of spectral weight below 25 meV, no gap feature is visible in A1g scattering geometry.
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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/434f5d28-d1d5-4720-9c49-dd57108e27df