@article{00837e0ecb9b4cacaa9d5d51d59c4332,
title = "High-energy continuum of magnetic excitations in the two-dimensional quantum antiferromagnet Sr2CuO2Cl2",
abstract = "We have measured the magnetic excitation spectrum of the model square-lattice spin-1/2 antiferromagnet Sr2CuO2Cl2 over a broad range of energies and momenta using high-resolution inelastic neutron scattering (INS). The magnon dispersion along the zone boundary was accurately measured to be a 43 meV between (1/2,0) and (3/4,1/4) indicating the importance of coupling beyond nearest neighbors in the spin Hamiltonian. We observe a strong momentum dependent damping of the zone-boundary magnons at (1/2,0) revealing a high-energy continuum of magnetic excitations. A direct comparison between our INS measurements and resonant inelastic x-ray scattering (RIXS) measurements shows that the RIXS spectrum contains significant contributions from higher energy excitations not previously considered. Our observations demonstrate that this high-energy continuum of magnetic fluctuations is an ubiquitous feature of insulating monolayer cuprates, apparent in both inelastic neutron and light scattering measurements.",
author = "Plumb, {K. W.} and Savici, {A. T.} and Granroth, {G. E.} and Chou, {F. C.} and Kim, {Young June}",
year = "2014",
month = may,
day = "23",
doi = "10.1103/PhysRevB.89.180410",
language = "English",
volume = "89",
journal = "Physical Review B - Condensed Matter and Materials Physics",
issn = "1098-0121",
publisher = "American Physical Society",
number = "18",
}