A fermi liquid electric structure and the nature of the carriers in high-T/sub c/ cuprates: A photoemission study

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We have performed angle-integrated and angle-resolved photoemission measurements at 20 K on well-characterized single crystals of high-T/sub c/ cuprates (both 1:2:3-type and 2:2:1:2-type) cleaved in situ, and find a relatively large, resolution limited Fermi edge which shows large amplitude variations with photon energy, indicative of band structure final state effects. The lineshapes of the spectra of the 1:2:3 materials as a function of photon energy are well reproduced by band structure predictions, indicating a correct mix of 2p and 3d orbitals on the calculations, while the energy positions of the peaks agree with calculated bands only to within /approx/0.5 eV. ... continued below

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Pages: 32

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Arko, A.J.; List, R.S.; Bartlett, R.J.; Cheong, S.W.; Fisk, Z.; Thompson, J.D. et al. January 1, 1989.

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We have performed angle-integrated and angle-resolved photoemission measurements at 20 K on well-characterized single crystals of high-T/sub c/ cuprates (both 1:2:3-type and 2:2:1:2-type) cleaved in situ, and find a relatively large, resolution limited Fermi edge which shows large amplitude variations with photon energy, indicative of band structure final state effects. The lineshapes of the spectra of the 1:2:3 materials as a function of photon energy are well reproduced by band structure predictions, indicating a correct mix of 2p and 3d orbitals on the calculations, while the energy positions of the peaks agree with calculated bands only to within /approx/0.5 eV. This may yet prove to reflect the effects of Coulomb correlation. We nevertheless conclude that a Fermi liquid approach to conductivity is appropriate. Angle-resolved data, while still incomplete, suggest agreement with the Fermi surface predicted by the LDA calculations. A BCS-like energy gap is observed in the 2:2:1:2 materials, whose magnitude is twice the weak coupling BCS value (i.e., 2/Delta/ = 7 KT/sub c/). 49 refs., 11 figs.

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Pages: 32

Notes

NTIS, PC A03/MF A01 - OSTI; 1.

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  • 9. vacuum ultraviolet radiation conference, Honolulu, HI, USA, 17-21 Jul 1989

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  • Other: DE89016774
  • Report No.: LA-UR-89-2680
  • Report No.: CONF-8907130-2
  • Grant Number: W-7405-ENG-36
  • Grant Number: W-31109-ENG-38
  • Grant Number: W-7405-ENG-82
  • Office of Scientific & Technical Information Report Number: 5627106
  • Archival Resource Key: ark:/67531/metadc1092166

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  • January 1, 1989

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  • Feb. 10, 2018, 10:06 p.m.

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  • March 28, 2018, 1:41 p.m.

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Arko, A.J.; List, R.S.; Bartlett, R.J.; Cheong, S.W.; Fisk, Z.; Thompson, J.D. et al. A fermi liquid electric structure and the nature of the carriers in high-T/sub c/ cuprates: A photoemission study, article, January 1, 1989; United States. (digital.library.unt.edu/ark:/67531/metadc1092166/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.