Quasiparticle excitations in valence-fluctuation materials: effects of band structure and crystal fields

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Evidence is now quite strong that the elementary hybridization model is the correct way to understand the lattice-coherent Fermi liquid regime at very low temperatures. Many-body theory leads to significant renormalizations of the input parameters, and many of the band-theoretic channels for hybridization are suppressed by the combined effects of Hund's-rule coupling, crystal-field splitting, and the f-f Coulomb repulsion U. Some exploratory calculations based on this picture are described, and some inferences are drawn about the band structures of several heavy-fermion materials. These inferences can and should be tested by suitably modified band-theoretic calculations. We find evidence for a significant ... continued below

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Pages: 21

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Brandow, B.H. January 1, 1985.

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Description

Evidence is now quite strong that the elementary hybridization model is the correct way to understand the lattice-coherent Fermi liquid regime at very low temperatures. Many-body theory leads to significant renormalizations of the input parameters, and many of the band-theoretic channels for hybridization are suppressed by the combined effects of Hund's-rule coupling, crystal-field splitting, and the f-f Coulomb repulsion U. Some exploratory calculations based on this picture are described, and some inferences are drawn about the band structures of several heavy-fermion materials. These inferences can and should be tested by suitably modified band-theoretic calculations. We find evidence for a significant Baber-scattering contribution in the very-low-temperature resistivity. A new mechanism is proposed for crossover from the coherent Fermi-liquid regime to the incoherent dense-Kondo regime. 28 refs.

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Pages: 21

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NTIS, PC A02/MF A01.

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  • 5. international conference on crystalline field effects in f-electron systems: ICCF5, Sendai, Japan, 15 Apr 1985

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  • Other: DE85010783
  • Report No.: LA-UR-85-1223
  • Report No.: CONF-8504115-2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5690674
  • Archival Resource Key: ark:/67531/metadc1092929

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  • January 1, 1985

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 25, 2018, 4:57 p.m.

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Brandow, B.H. Quasiparticle excitations in valence-fluctuation materials: effects of band structure and crystal fields, article, January 1, 1985; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1092929/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.