Heavy fermion quantum criticality: The party is just beginning

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Recently, Nature reported the discovery of a ferromagnetic quantum critical point (FM QCP) in the heavy fermion compound CeRh6Ge4 [1].This is the first discovery of such kind in a stoichiometric compound.The FM order is suppressed at a critical pressure of 0.8 GPa, beyond which the ground state turns into a Fermi liquid.Previously, Science had also reported the observation of a FM QCP, albeit in the doped compound YbNi4(P0.92As0.08)2 [2], where the As doping provides a negative chemical pressure.The current discovery in CeRh6Ge4 avoids the possible disorder effect and adds a clean and new member to the families of heavy fermion quantum criticality.
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