Demonstrated that CeCoIn5 can be tuned across a quantum critical point with small amounts of chemical doping, without any symmetry breaking.
Significance and Impact
This finding suggests a fraction of the electrons are frozen in space, but their spins are still capable of moving in the form of a spin liquid, giving a clue to the underlying ground state that is behind superconductivity.
- High magnetic field Hall Measurements confirm carrier density change.
- Quantum oscillations and ARPES confirm change in Fermi surface directly. Confirmed by DFT.
- Simulations of the Hall effect in Fractional Fermi liquid theory confirm the system is consistent with FFL state