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New hints on the origin of quantum criticality in CeCoIn5: A Hall effect study

  • Author(s): Capan, C
  • Singh, S
  • Wirth, S
  • Nicklas, M
  • Lee, H
  • Fisk, Z
  • DiTusa, J
  • Steglich, F
  • et al.

We report Hall Effect measurements under pressure in the normal state of CeCoIn , from 60 to 355 mK and for fields exceeding the superconducting upper critical field H , with the field oriented parallel to [0 0 1]. At low pressures, the field dependence of the Hall coefficient exhibits a scaling consistent with the one reported in the normal state at higher temperatures, but at odds with the Δ H / T scaling expected near a field tuned quantum critical point. The breakdown of this scaling at higher pressures, concomitant with the suppression of spin fluctuations, suggests that it is a hallmark of the spin fluctuations. 5 c 2

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