Electronic Raman scattering in underdoped {bold YBa}{sub {bold 2}}{bold Cu}{sub {bold 3}}{bold O}{sub {bold 6.5}}
- Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (CANADA)
- Department of Physics, University of British Columbia, Vancouver, British Columbia, V6T 1Z1 (CANADA)
The polarized Raman spectra of underdoped YBa{sub 2}Cu{sub 3}O{sub 6.5} (T{sub c}=61 K) have been measured. The XY(B{sub 2g}) spectrum exhibits a superconductivity-induced redistribution and a frequency dependence that suggests the presence of nodes near the ({plus_minus}1,{plus_minus}1) directions in k space. The X{sup {prime}}Y{sup {prime}}(B{sub 1g}) spectrum is unaffected by the transition to the superconducting state and the intensity I(B{sub 1g}) is significantly reduced relative to the level found in optimally doped compounds. This drop in intensity occurs because of a loss of spectral weight from the regions of the Brillouin zone near ({pi},0), which is associated with the opening of a pseudogap in the underdoped compound. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 531843
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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