2005/11/30 by Andreas Luscher, Andreas Lüscher, Gregoire Misguich +5 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Computer science #Magnetic and transport properties of perovskites and related materials #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.73.085122
published as Phys. Rev. B 73, 085122 (2006) · 13 pages, 8 figures
arxiv created 2006/02/21 · openalex publication_date 2006/02/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Experimental observations of lightly doped La_2\ensuremath-xSrxCuO4, x<0.02, revealed remarkable magnetic properties such as the incommensurate noncollinear ordering (additional to the N'eel ordering) and a tremendous doping dependence of the uniform longitudinal susceptibility. We show that the spiral solution of the t\text\ensuremath-t^\ensuremath'\text\ensuremath-t^\ensuremath''\text\ensuremath-J 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.