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Universal nonlinear conductivity close to an itinerant-electron quantum critical point

Hogan, PM; Green, AG; (2008) Universal nonlinear conductivity close to an itinerant-electron quantum critical point. Physical Review B , 78 (19) , Article 195104. 10.1103/PhysRevB.78.195104. Green open access

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Abstract

We study the conductivity in itinerant-electron systems near to a magnetic quantum critical point. We show that, for a class of geometries, the universal power-law dependence of resistivity upon temperature may be reflected in a universal nonlinear conductivity; when a strong electric field is applied, the resulting current has a universal power-law dependence upon the applied electric field. For a system with thermal-equilibrium current proportional to T-alpha and dynamical exponent z, we find a nonlinear resistivity proportional to E(z-1)/[z(1+alpha)-1].

Type: Article
Title: Universal nonlinear conductivity close to an itinerant-electron quantum critical point
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.78.195104
Publisher version: http://dx.doi.org/10.1103/PhysRevB.78.195104
Language: English
Additional information: © APS 2008
Keywords: Band model of magnetism, Electrical conductivity, Ferromagnetism, Magnetic transitions, Nonzero-temperature, Fluctuations
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/1333465
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