Valence-fluctuation scenario for cuprate superconductivity: The finite-U pairing mechanism

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The ideal that the normal state of cuprate superconductors is a valence-fluctuation (VF) state is appealing for a number of reasons. We are exploring this scenario quantitatively, focussing especially on the finite-U mechanism for s-wave pairing. The calculations employ a many-body variational technique developed previously for VF and heavy-fermion materials. We are presently exploring the effects of (a) varying the Hamiltonian parameters away from the values obtained from photoemission data analysis, (b) various simple assumptions for the band structure and hybridization k-dependence, and (c) corrections and to the Gutzwiller approximation. These are the topics to be discussed in this report. ... continued below

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Brandow, B.H. January 1, 1991.

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The ideal that the normal state of cuprate superconductors is a valence-fluctuation (VF) state is appealing for a number of reasons. We are exploring this scenario quantitatively, focussing especially on the finite-U mechanism for s-wave pairing. The calculations employ a many-body variational technique developed previously for VF and heavy-fermion materials. We are presently exploring the effects of (a) varying the Hamiltonian parameters away from the values obtained from photoemission data analysis, (b) various simple assumptions for the band structure and hybridization k-dependence, and (c) corrections and to the Gutzwiller approximation. These are the topics to be discussed in this report. 17 refs., 1 fig.

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Pages: (9 p)

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OSTI; NTIS; GPO Dep.

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  • Electronic structure and mechanisms for high temperature superconductivity, Coral Gables, FL (USA), 3-9 Jan 1991

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  • Other: DE91009953
  • Report No.: LA-UR-91-893
  • Report No.: CONF-910145--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6049362
  • Archival Resource Key: ark:/67531/metadc1100074

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  • January 1, 1991

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  • Feb. 18, 2018, 3:59 p.m.

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  • May 30, 2018, 1:41 p.m.

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Brandow, B.H. Valence-fluctuation scenario for cuprate superconductivity: The finite-U pairing mechanism, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1100074/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.