Is there a correlation between Tc and the features of the B1g Raman continuum in YBa2Cu3O7−gd?

✍ Scribed by M. Käll; A.P. Litvinchuk; P. Larsson; G. Brorsson; L. Börjesson

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 251 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91772-8

✦ Synopsis

The Big-symmetry Raman spectra of lightly Co-substituted YBa2(Cu3_xCox)O6.95 (x=0-0.05, Tc=91.4K-86K) thin films have been investigated. We find that the low temperature peak in the B lg continuum, at -500 cm -1, shifts to higher frequencies with increasing Co-substitution, corresponding to a reduction of Tc in the slightly underdoped region. Comparing these findings with published results on slightly overdoped YBa2Cu307 we conclude that the Big Raman continuum peak frequency scales inversely with hole doping within the Tc--90K doping plateau ef the Y123 system. The lack of a correlation between Tc and the frequency of the Big continuum peak suggests that this peak is not due to scattering across a superconducting gap.