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

Abstract

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}

Authors:
; ; ; ;  [1]; ;  [2]; ;  [3]
  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)
Publication Date:
OSTI Identifier:
549679
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 78; Journal Issue: 25; Other Information: PBD: Jun 1997
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Nemetschek, R., Opel, M., Hoffmann, C., Mueller, P.F., Hackl, R., Berger, H., Forro, L., Erb, A., and Walker, E. Pseudogap and Superconducting Gap in the Electronic Raman Spectra of Underdoped Cuprates. United States: N. p., 1997. Web. doi:10.1103/PhysRevLett.78.4837.
Nemetschek, R., Opel, M., Hoffmann, C., Mueller, P.F., Hackl, R., Berger, H., Forro, L., Erb, A., & Walker, E. Pseudogap and Superconducting Gap in the Electronic Raman Spectra of Underdoped Cuprates. United States. doi:10.1103/PhysRevLett.78.4837.
Nemetschek, R., Opel, M., Hoffmann, C., Mueller, P.F., Hackl, R., Berger, H., Forro, L., Erb, A., and Walker, E. Sun . "Pseudogap and Superconducting Gap in the Electronic Raman Spectra of Underdoped Cuprates". United States. doi:10.1103/PhysRevLett.78.4837.
@article{osti_549679,
title = {Pseudogap and Superconducting Gap in the Electronic Raman Spectra of Underdoped Cuprates},
author = {Nemetschek, R. and Opel, M. and Hoffmann, C. and Mueller, P.F. and Hackl, R. and Berger, H. and Forro, L. and Erb, A. and Walker, E.},
abstractNote = {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}},
doi = {10.1103/PhysRevLett.78.4837},
journal = {Physical Review Letters},
number = 25,
volume = 78,
place = {United States},
year = {Sun Jun 01 00:00:00 EDT 1997},
month = {Sun Jun 01 00:00:00 EDT 1997}
}