Modulated spiral phases in doped quantum antiferromagnets

Issue		J. Phys. France Volume 51, Number 9, mai 1990


Page(s)		847 - 856
DOI		10.1051/jphys:01990005109084700

J. Phys. France 51, 847-856 (1990)
DOI: 10.1051/jphys:01990005109084700

Modulated spiral phases in doped quantum antiferromagnets

Thierry Dombre

Centre de Recherches sur les Très Basses Températures, CNRS, BP 166 X, 38042 Grenoble, France

Abstract
We study the spiral phase discovered by Shraiman and Siggia, in the regime of coupling constant where the effective spin wave stiffness is negative. We show that this instability does not signal a phase separation but rather the formation of domain walls in the (1,1) or (1,1) directions on a square lattice, where holes get trapped. We discuss briefly the interplay between dipolar and Coulomb interactions in the resulting structure.

Résumé
Nous étudions la phase spirale découverte par Shraiman et Siggia, dans le régime où sa constante de raideur devient négative. Nous montrons que cette instabilité ne signale pas une séparation de phase mais plutôt la formation de murs suivant les directions (1, 1) ou (1,1) sur un réseau carré, où les trous se localisent. Nous discutons brièvement l'effet d'une répulsion coulombienne à longue portée dans une telle structure.

PACS
7530D - Spin waves.
7560C - Domain walls and domain structure.

Key words
antiferromagnetism -- magnetic domain walls -- spin waves

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