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We study quantum phase transitions from easy-plane antiferromagnetic metalsto paramagnetic metals in Kondo-Heisenberg lattice systems. If the paramagneticmetal is a fractionalized Fermi liquid then the universal critical propertiesof the phase transition are unaffected for a weak Kondo coupling even when theFermi surface intersects the magnetic zone boundary. This is in strikingcontrast to the conventional theory of phase transitions between paramagneticand antiferromagnetic metals where any Kondo coupling is strongly relevant, andleads to a Landau-damped `Hertz-Millis' theory. The electron quasi-particleremains well-defined in the quantum critical regime and the critical spinfluctuations only contribute subleading corrections to the various propertiesof conduction electrons.

Quantum phase transition from an antiferromagnet to a spin liquid in a metal