Nature of the quantum phase transition to a spin-nematic phase

Details Nature of the quantum phase transition to a spin-nematic phase Nature of the quantum phase transition to a spin-nematic phase

2011-01-07

arxiv.org/abs/1101.1478v1

Physics

Condensed Matter

Strongly Correlated Electrons

4pp, 2 eps figs

Scientific paper

It is shown that the quantum phase transition in metallic non-s-wave ferromagnets, or spin nematics, is generically of first order. This is due to a coupling of the order parameter to soft electronic modes that play a role analogous to that of the electromagnetic vector potential in a superconductor, which leads to a fluctuation-induced first-order transition. A generalized mean-field theory for the p-wave case is constructed that explicitly shows this effect. Tricritical wings are predicted to appear in the phase diagram in a spatially varying magnetic field, but not in a homogeneous one.

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