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We present Raman spectra of low and high-energy charge and spin excitations in Bi 2 Sr 2 CaCu 2 O 8−δ single crystals with an optimized critical temperature of 95K. The prominent feature of the high-energy background at around 250meV is a rearrangement of spectral weight in B 1g and A 1g +B 2g symmetry below the critical temperature, similar...
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