Local spin spirals in the Neel phase of La_{2-x}Sr_xCuO_4

Abstract

Experimental observations of lightly doped La_{2-x}Sr_xCuO_4, x < 0.02, revealed remarkable magnetic properties such as the incommensurate noncollinear ordering (additional to the Neel ordering) and a tremendous doping dependence of the uniform longitudinal susceptibility. We show that the spiral solution of the t-t'-t''-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.

arXiv comment13 pages, 8 figures

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• Destruction of Neel order and local spin spirals in insulating La_{2-x}Sr_xCuO_4
• Consideration of Thermal Hall Effect in Undoped Cuprates
• Nematic and spin-charge orders driven by hole-doping a charge-transfer insulator
• Effective action, magnetic excitations and quantum fluctuations in lightly doped single layer cuprates
• Competing impurities and reentrant magnetism in La(2-x)Sr(x)Cu(1-z)Zn(z)O(4) revisited. The role of the Dzyaloshinskii-Moriya and XY anisotropies
• Negative Hopping Magnetoresistance and Dimensional Crossover in Lightly Doped Cuprate Superconductors
• Effective action of the weakly doped t-J model and spin-wave excitations in the spin-glass phase of La_{2-x}Sr_xCuO_4
• Magneto-elastic coupling between copper spin configurations and oxygen octahedra in La(2-x)Sr(x)CuO(4). Untwinning, Raman (phonon) spectrum, and neutron response
• Anisotropies in insulating La${}_{2-x}$Sr${}_x$CuO${}_4$: angular resolved photoemission and optical absorption
• Impurity susceptibility and the fate of spin-flop transitions in lightly-doped La(2)CuO(4)
• AC Hopping Magnetotransport Across the Spin Flop Transition in Lightly Doped La_2CuO_4