2006/09/13 by Dao‐Xin Yao, D. X. Yao, E. W. Carlson · 7 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Coupling (piping) #Magnetic and transport properties of perovskites and related materials #Materials science #Optics #Physics #Physics of Superconductivity and Magnetism #Scattering #Spin (aerodynamics) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.75.012414
published in Physical Review B 75(1) (American Physical Society) · 4 pages, 5 figures
arxiv created 2006/09/13 · openalex publication_date 2007/01/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Recent neutron scattering measurements reveal spin and charge ordering in the half-doped nickelate, La3∕2Sr1∕2NiO4. Many of the features of the magnetic excitations have been explained in terms of the spin waves of diagonal stripes with a magnetic coupling structure which is fourfold symmetric. However, an optical mode dispersing away from the (\ensuremathπ,\ensuremathπ) point was not captured by this theory. We show here that this apparent optical mode is a natural consequence of stripe twinning in a diagonal stripe pattern with a magnetic coupling structure which is twofold symmetric, i.e., one possessing the same spatial rotational symmetry as the ground state.