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Electrical transport properties of CaB6

  • Author(s): Stankiewicz, J
  • Sesé, J
  • Balakrishnan, G
  • Fisk, Z
  • et al.
Abstract

© 2014 American Physical Society. We report results from a systematic electron-transport study in a broad temperature range on 12 CaB6 single crystals. None of the crystals were intentionally doped. The different carrier densities observed presumably arise from slight variations in the Ca:B stoichiometry. In these crystals, the variation of the electrical resistivity and of the Hall effect with temperature can be consistently accounted for by the model we propose, in which B-antisite defects (B atom replacing Ca atom) are "amphoteric." The magnetotransport measurements reveal that most of the samples we have studied are close to a metal-insulator transition at low temperatures. The magnetoresistance changes smoothly from negative - for weakly metallic samples - to positive values - for samples in a localized regime.

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