Pressure Study of Quantum Criticality in CeCoIn5

Details Pressure Study of Quantum Criticality in CeCoIn5 Pressure Study of Quantum Criticality in CeCoIn5

2006-02-03

arxiv.org/abs/cond-mat/0602089v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figs, PRB in press

Scientific paper

10.1103/PhysRevB.73.064519

We report resistivity measurements in the normal state of CeCoIn5 down to 40 mK and simultaneously in magnetic fields up to 9 T in the [001] crystallographic direction and under pressures up to 1.3 GPa. At ambient pressure the data are consistent with a field tuned quantum critical point coincident with the superconducting upper critical field H_{c2}, as observed previously. We find that with increasing pressure the quantum critical point moves inside the superconducting dome to lower fields. Thus, we can rule out that superconductivity is directly responsible for the non-Fermi liquid behavior in CeCoIn5. Instead, the data point toward an antiferromagnetic quantum critical point scenario.

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