Quantum order-by-disorder driven phase reconstruction in the vicinity of ferromagnetic quantum critical points
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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.
Karahasanovic , U , Kruger , F & Green , A 2012 , ' Quantum order-by-disorder driven phase reconstruction in the vicinity of ferromagnetic quantum critical points ' Physical Review. B, Condensed matter and materials physics , vol 85 , no. 16 , 165111 . DOI: 10.1103/PhysRevB.85.165111
Physical Review. B, Condensed matter and materials physics
© 2012 American Physical Society
DescriptionThis work was supported by EPSRC under Grant No. EP/I 004831/1.
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