Issue
EPL
Volume 84, Number 2, October 2008
Article Number 27007
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/84/27007
Published online 14 October 2008
EPL, 84 (2008) 27007
DOI: 10.1209/0295-5075/84/27007

Effect of disorder on a Pomeranchuk instability

A. F. Ho1 and A. J. Schofield2

1   Department of Physics, Royal Holloway, University of London - Egham, Surrey TW20 0EX, UK, EU
2   School of Physics and Astronomy, University of Birmingham - Birmingham B15 2TT, UK, EU


received 23 July 2008; accepted in final form 9 September 2008; published October 2008
published online 14 October 2008

Abstract
We study the effect of weak and dilute disorder on the order parameter equation and transition temperature of a Pomeranchuk-type Fermi-surface instability using replica mean-field theory. We consider the example of a phase transition to a dx2- y2 type Fermi surface distortion, and show that, in the regime where such a transition is second order, the transition temperature is reduced by disorder in essentially the same way as that for a d-wave superconductor. We argue that observing this disorder dependence of metal-to-metal transition is a useful indicator of a finite angular momentum Fermi surface distortion.

PACS
71.10.Ay - Fermi-liquid theory and other phenomenological models.
71.23.-k - Electronic structure of disordered solids.

© EPLA 2008