Issue
EPL
Volume 83, Number 6, September 2008
Article Number 67008
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/83/67008
Published online 15 September 2008
EPL, 83 (2008) 67008
DOI: 10.1209/0295-5075/83/67008

New field-induced spin density wave phenomena from the Pauli terms in excitonic insulators

A. Aperis1, M. Georgiou1, G. Roumpos1, S. Tsonis1, G. Varelogiannis1 and P. B. Littlewood2

1   Department of Physics, National Technical University of Athens - GR-15780 Athens, Greece, EU
2   Cavendish Laboratory, University of Cambridge - Cambridge CB3 03E, UK, EU

varelogi@central.ntua.gr

received 13 May 2008; accepted in final form 20 July 2008; published September 2008
published online 15 September 2008

Abstract
Usually, one expects the Zeeman magnetic field to compete with a charge density wave (CDW) or a spin density wave (SDW). We report for the first time here that under quite generic conditions, the Zeeman magnetic field may induce transitions from CDW to CDW+SDW therefore generating SDW states that could not exist at zero field. Our field-induced CDW to SDW+CDW transition may provide among others, a direct explanation to puzzling for two decades findings in 2H-TaS2.

PACS
75.30.Fv - Spin-density waves.
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.).

© EPLA 2008