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

Abstract

We reinterpret neutron scattering and Raman spectroscopy experiments in La(2-x)Sr(x)CuO(4), showing modulation of spin and lattice degrees of freedom both in the low-temperature orthorhombic and tetragonal phases, in terms of a magneto-elastic coupling between noncollinear configurations for the copper spins and the oxygen octahedra. The magneto-elastic coupling furthermore explains the recently discovered magnetic-field induced untwinning in La(2-x)Sr(x)CuO(4), for x<2%, and allows us to understand why in La(2-x-y)Sr(x)Nd(y)CuO(4) with y=0.4 and x=1/8, for example, when (1,0) and/or (0,1) static spin spirals are stabilized due to hole frustration, the atomic modulation in the low-temperature tetragonal phase of La(2-x-y)Sr(x)Nd(y)CuO(4) has a periodicity of 4 lattice spacings, half the magnetic one.

5 pages, 5 figures, Revised version, to appear in Physical Review B

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• Magnetic susceptibility anisotropies in a two-dimensional quantum Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interactions
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Cited by in corpus (2)

• Lattice effects in the La${}_{2-\mathrm{x}}$Sr${}_{\mathrm{x}}$CuO${}_4$ compounds
• Charge stripe order from antiphase spin spirals in the spin-Fermion model