Hall Effect under pressure in CeCoIn5*

Important deviations from Landau Fermi Liquid theory are observed in many rare-earth compounds known as heavy fermion compounds. These anomalies can be ascribed to the presence of a quantum critical point (QCP) separating two different ground states in the phase diagram of these compounds. A quantum phase transition is a continuous ground state transformation driven by quantum fluctuations. In this context, CeCoIn5, a recently discovered heavy fermion superconductor, has been at the focus of intensive investigations. In this material, thermodynamic and transport properties point to a field-tuned QCP, whose origin remains elusive. At ambient pressure, this QCP is close to the superconducting upper critical field, and a Sn-doping study has failed to separate the two. We present new results on Hall Effect under pressure in a single crystal CeCoIn5 and discuss the origin of the QCP and its evolution with pressure.