The rare earth perovskite nickelates 5,6 5. On the metallic side of the T = 0 K Mott transition, one has a correlated metallic state without a gap or a T > 0 K transition in this regime, it is more challenging to find evidence for a low energy scale associated with Mott physics. On the side for which the ground state is insulating, several obvious energy scales exist, such as the single-particle gap, or the critical temperature for a thermally driven metal-insulator transition (MIT) and/or magnetic ordering transition. A continuous quantum phase transition (QPT) is quantum critical, which implies the presence of characteristic energies that vanish on approaching the transition point from either direction. ![]() Second order or continuous T = 0 K Mott transitions are believed to be tied to many interesting phenomena, such as marginal Fermi liquid behavior and quantum spin liquid states.
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