Pseudogap and Superconducting Gap in the Electronic Raman Spectra of Underdoped Cuprates

Journal Article · Sun Jun 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.4837· OSTI ID:549679

Nemetschek, R; Opel, M; Hoffmann, C; Mueller, P F; Hackl, R ^[1]; Berger, H; Forro, L ^[2]; Erb, A; Walker, E ^[3]

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1. Walther Meissner Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching (Germany)
2. Ecole Polytechnique Federale de Lausanne, Ecublens, CH-1015 Lausanne (Switzerland)
3. DPMC, Universite de Geneve, CH-1211 Geneve (Switzerland)

Raman spectra of YBa{sub 2}Cu {sub 3}O{sub 7-x} and Bi{sub 2}Sr {sub 2}(Ca {sub 0.62}Y{sub 0.38})Cu{sub 2}O{sub 8+{delta}} with T{sub c}{congruent}0.65T{sup max}{sub c} in the underdoped regime of the phase diagram are studied as a function of temperature and polarization. At B{sub 2g}(xy) symmetry a reduction of spectral weight by 10{percent} for frequencies less than 700cm{sup -1} or 15k{sub B}T{sub c} is found below approximately 200K. Below T{sub c}, a superconducting gap opens up which closely resembles that observed at higher doping levels. It is compatible with d{sub x{sup 2}-y{sup 2}} pairing and its amplitude 2{Delta}{sub 0} can be estimated to be 8k{sub B}T{sub c}. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 549679
• Journal Information: Physical Review Letters, Vol. 78, Issue 25; Other Information: PBD: Jun 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
ENERGY GAP
RAMAN SPECTRA
YTTRIUM OXIDES
BARIUM OXIDES
COPPER OXIDES
BISMUTH OXIDES
CALCIUM OXIDES
STRONTIUM OXIDES
PHASE DIAGRAMS
POLARIZATION
TEMPERATURE DEPENDENCE
CRYSTAL DOPING