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Recent neutron scattering measurements reveal spin and charge ordering in thehalf-doped nickelate, La$_{3/2}$ Sr$_{1/2}$ NiO$_4$. Many of the features ofthe magnetic excitations have been explained in terms of the spin waves ofdiagonal stripes with weak single-ion anisotropy. However, an optical modedispersing away from the (\pi,\pi) point was not captured by this theory. Weshow here that this apparent optical mode is a natural consequence of stripetwinning in a diagonal stripe pattern with a magnetic coupling structure whichis two-fold symmetric, i.e. one possessing the same spatial rotational symmetryas the ground state.Comment: 4 pages, 5 figure

physical review. b, condensed matter and materials physics

Spin-wave dispersion in half-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>NiO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Spin-wave dispersion in half-dopedLa3∕2Sr1∕2NiO4