A 27 l NMR study of the mixed valence compound CeFe2 Al10

S. C. Chen, C. S. Lue

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Abstract

We report the results of a A 27 l nuclear magnetic resonance (NMR) study on the mixed valence compound CeFe2 Al10 at temperatures between 4 and 300 K. This material has been of current interest due to indications of Kondo insulator behavior. Five A 27 l NMR resonance lines that are associated with five nonequivalent crystallographic aluminum sites have been resolved. For each individual aluminum site, the temperature-dependent NMR Knight shift exhibits a character of valence fluctuation behavior with a broad maximum at around 70 K. At low temperatures, the Knight-shift results show a thermally activated feature, indicating the formation of an energy gap in this material. We interpret the Knight-shift data based on a proposed model density of states and the gap size of 110 K is properly estimated. A further analysis indicates that the observed gap in CeFe2 Al10 should be characterized as a pseudogap with a finite number of carriers at the Fermi level.

Original languageEnglish
Article number075113
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number7
DOIs
Publication statusPublished - 2010 Feb 18

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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