Abstract
We report Hall Effect measurements under pressure in the normal state of CeCoIn 5, from 60 to 355 mK and for fields exceeding the superconducting upper critical field H c 2 , 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.
Highlights
The tetragonal heavy fermion (HF) compounds CeMIn5 ðM 1⁄4 Rh; Co; IrÞ continue to provide an exciting opportunity for investigating quantum criticality and its interplay with unconventional superconductivity
Non-Fermi liquid (NFL) behavior is observed in the normal state for fields above the upper critical field ðHc2Þ corresponding to the suppression of the superconducting phase
The corresponding critical field coincides with Hc2 in the H–T phase diagram at ambient pressure [5,6,7,9]
Summary
The tetragonal heavy fermion (HF) compounds CeMIn5 ðM 1⁄4 Rh; Co; IrÞ continue to provide an exciting opportunity for investigating quantum criticality and its interplay with unconventional superconductivity. Non-Fermi liquid (NFL) behavior is observed in the normal state for fields above the upper critical field ðHc2Þ corresponding to the suppression of the superconducting phase. In the unusual case of CeCoIn5 [7], a magnetic field tuned QCP [8] is suggested.
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