11B-NMR in CaB6

  • Gavilano J
  • Mushkolaj S
  • Rau D
 et al. 
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We report the results of11B-NMR measurements on CaB6. In an attempt to prepare a material with chemical composition close to stoichiometric CaB6, a slight excess of Ca was used in the sample preparation. Significant physical properties of CaB6are an increase of the electrical resistance by four orders of magnitude below 300 K and the absence of ferromagnetic order above 2 K. The variation of T1-1with temperature of CaB6is similar to T1-1(T) of Ca0.995La0.005B6and SrB6, but the magnitude of the relaxation rate of the former is one order of magnitude larger. This observation is interpreted as an indication that CaB6still contains a non-negligible amount of self-doping, but the corresponding magnetic moments do not order spontaneously. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Magnetism
  • NMR

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  • J. L. Gavilano

  • Sh Mushkolaj

  • D. Rau

  • H. R. Ott

  • A. Bianchi

  • D. P. Young

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