Understand
The formation of new phases close to itinerant electron quantum critical points has been observed experimentally in many compounds.
- We present a unified analytical model that explains the emergence of new types of order around itinerant ferromagnetic quantum critical points.
- The central idea of our analysis is that certain Fermi-surface deformations associated with the onset of the competing order enhance the phase-space available for low-energy quantum fluctuations and so self-consistently lower the free energy.
- We demonstrate that this quantum order-by-disorder mechanism leads to instabilities towards the formation of spiral and d-wave spin nematic phases close to itinerant ferromagnetic quantum critical points in three spatial dimensions.
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