UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Quantum Order-by-Disorder Near Criticality and the Secret of Partial Order in MnSi

Krueger, F; Karahasanovic, U; Green, AG; (2012) Quantum Order-by-Disorder Near Criticality and the Secret of Partial Order in MnSi. Physical Review Letters , 108 (6) , Article 067003. 10.1103/PhysRevLett.108.067003. Green open access

[img]
Preview
PDF
1333461.pdf
Available under License : See the attached licence file.

Download (762kB)

Abstract

The vicinity of quantum phase transitions has proven fertile ground in the search for new quantum phases. We propose a physically motivated and unifying description of phase reconstruction near metallic quantum-critical points using the idea of quantum order by disorder. Certain deformations of the Fermi surface associated with the onset of competing order enhance the phase space available for low-energy, particle-hole fluctuations and self-consistently lower the free energy. Applying the notion of quantum order by disorder to the itinerant helimagnet MnSi, we show that, near the quantum critical point, fluctuations lead to an increase of the spiral ordering wave vector and a reorientation away from the lattice-favored directions. The magnetic ordering pattern in this fluctuation-driven phase is found to be in excellent agreement with the neutron-scattering data in the partially ordered phase of MnSi.

Type: Article
Title: Quantum Order-by-Disorder Near Criticality and the Secret of Partial Order in MnSi
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.108.067003
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.108.067003
Language: English
Additional information: © 2012 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/1333461
Downloads since deposit
149Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item