NMR probe of pseudogap characteristics

C. Lue, Joseph H. Ross

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

We report the results of a (Formula presented) nuclear magnetic resonance (NMR) study of (Formula presented) near the ordered composition with (Formula presented) at temperatures between 4 and 500 K. All compositions are found to be metallic or semimetallic, though electrical resistivity has indicated a metal-insulator transition at (Formula presented) The low-temperature NMR relaxation rates for stoichiometric (Formula presented) and nonstoichiometric (Formula presented) and (Formula presented) compounds follow a Korringa law, associated with a finite density of carriers at the Fermi level. High-temperature relaxation rates for (Formula presented) go over to a semiconductorlike activated form, providing information about the gap structure near the Fermi energy. The results are consistent with pseudogap features identified by recent band-structure calculations, although with smaller energy splittings. We analyze pseudogap changes vs composition, and compare the band-filling behavior to a recent coherent potential approximation calculation.

Original languageEnglish
Pages (from-to)9863-9866
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number15
DOIs
Publication statusPublished - 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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