Issue
EPL
Volume 82, Number 6, June 2008
Article Number 67007
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/82/67007
Published online 10 June 2008
EPL, 82 (2008) 67007
DOI: 10.1209/0295-5075/82/67007

Coexistence of CDW with staggered superconductivity in a ferromagnetic material

M. Georgiou1, G. Varelogiannis1 and P. Thalmeier2

1  Department of Physics, National Technical University of Athens - GR-15780 Athens, Greece, EU
2  Max Planck Institute for Chemical Physics of Solids - D-01187 Dresden, Germany, EU

varelogi@central.ntua.gr

received 5 March 2008; accepted in final form 1 May 2008; published June 2008
published online 10 June 2008

Abstract
In usual superconductivity (SC), the pairs have zero total momentum irrespective of their symmetry. Staggered SC would involve, instead, pairs with a finite commensurate total momentum, but such exotic states have never been proven to be realized in nature. Here we study for the first time the influence of particle-hole asymmetry on the competition of staggered SC with Charge Density Waves (CDW) in a ferromagnetic medium. We obtain unprecedented situations in which CDW and staggered SC coexist. We also obtain cases of a SC dome near the collapse of a CDW state as well as cascades of transitions that exhibit remarkable similarities with the pressure phase diagram in UGe2, suggesting that SC in this material may be staggered coexisting and competing with a CDW state.

PACS
74.20.-z - Theories and models of superconducting state.
74.20.Rp - Pairing symmetries (other than s-wave).

© EPLA 2008