Electronic Raman scattering in underdoped {bold YBa}{sub {bold 2}}{bold Cu}{sub {bold 3}}{bold O}{sub {bold 6.5}}

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.R513· OSTI ID:531843

Chen, X K; Naeini, J G; Hewitt, K C; Irwin, J C ^[1]; Liang, R; Hardy, W N ^[2]

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1. Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (CANADA)
2. 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

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM OXIDES
BRILLOUIN ZONES
COPPER OXIDES
CRYSTAL DOPING
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
RAMAN SPECTRA
SUPERCONDUCTIVITY
YTTRIUM OXIDES