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Quantum order-by-disorder driven phase reconstruction in the vicinity of ferromagnetic quantum critical points

Karahasanovic, U; Krueger, F; Green, AG; (2012) Quantum order-by-disorder driven phase reconstruction in the vicinity of ferromagnetic quantum critical points. Physical Review B , 85 (16) , Article 165111. 10.1103/PhysRevB.85.165111. Green open access

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Abstract

The formation of new phases close to itinerant electron quantum critical points has been observed experimentally in many compounds. We present a unified analytical framework to explain 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 toward the formation of spiral and d-wave spin-nematic phases close to itinerant ferromagnetic quantum critical points in three spatial dimensions.

Type: Article
Title: Quantum order-by-disorder driven phase reconstruction in the vicinity of ferromagnetic quantum critical points
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.85.165111
Publisher version: http://dx.doi.org/10.1103/PhysRevB.85.165111
Language: English
Additional information: © 2014 American Physical Society
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1337556
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