Spin and charge excitations in optimally doped Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8-delta}.
We present Raman spectra of low and high-energy charge and spin excitations in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8-{delta}} 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 B{sub 1g} and A{sub 1g}+B{sub 2g} 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 B{sub 1g} 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 A{sub 1g} scattering geometry.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 942797
- Report Number(s):
- ANL/MSD/JA-34683; JPCSAW; TRN: US200922%%597
- Journal Information:
- J. Phys. Chem. Solids, Vol. 59, Issue 10-12 ; 1998; ISSN 0022-3697
- Country of Publication:
- United States
- Language:
- ENGLISH
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