Local spin spirals in the Néel phase of La2xSrxCuO4

Andreas Lüscher, Grégoire Misguich, Alexander I. Milstein, and Oleg P. Sushkov
Phys. Rev. B 73, 085122 – Published 28 February 2006

Abstract

Experimental observations of lightly doped La2xSrxCuO4, x<0.02, revealed remarkable magnetic properties such as the incommensurate noncollinear ordering (additional to the Néel ordering) and a tremendous doping dependence of the uniform longitudinal susceptibility. We show that the spiral solution of the tttJ model obtained by taking into account the Coulomb trapping of holes by Sr ions describes these puzzling data perfectly well. Our solution firstly explains why the incommensurate structure is directed along the orthorhombic b axis, and secondly allows a numerical calculation of the positions and shapes of the incommensurate neutron scattering peaks. Thirdly, we calculate the doping dependence of the spin-wave gap, and lastly, we study the longitudinal magnetic susceptibility and show that its doping dependence is due to the noncollinearity of the spin spiral.

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  • Received 20 November 2005

DOI:https://doi.org/10.1103/PhysRevB.73.085122

©2006 American Physical Society

Authors & Affiliations

Andreas Lüscher1, Grégoire Misguich2, Alexander I. Milstein3, and Oleg P. Sushkov1

  • 1School of Physics, University of New South Wales, Sydney 2052, Australia
  • 2Service de Physique Théorique, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
  • 3Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia

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Issue

Vol. 73, Iss. 8 — 15 February 2006

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