High-Frequency Spin Waves in YBa2Cu3O6.15
S. M. Hayden (University of Bristol), G. Aeppli (AT&T Bell, Laboratories), T. G. Perring (Rutherford Laboratory), H. A. Mook (Oak Ridge, National Laboratory), F. Dogan (University of Washington)
TL;DR
This study uses pulsed neutron spectroscopy to measure high-frequency spin waves in insulating YBa2Cu3O6.15, revealing acoustic and optical modes up to 250 meV and providing detailed exchange constants.
Contribution
It provides the first absolute measurements of dynamic magnetic susceptibility and confirms linear-spin-wave theory accurately describes the observed spin excitations.
Findings
Optical modes appear at 74 meV.
Exchange constants are J_parallel=125 meV, J_perp=11 meV.
Spin-wave intensity renormalization Z_chi=0.4.
Abstract
Pulsed neutron spectroscopy is used to make absolute measurements of the dynamic magnetic susceptibility of insulating YBa2Cu3O6.15. Acoustic and optical modes, derived from in- and out-of-phase oscillation of spins in adjacent CuO2 planes, dominate the spectra and are observed up to 250 meV. The optical modes appear first at 74 meV. Linear-spin-wave theory gives an excellent description of the data and yields intra- and inter-layer exchange constants of J_parallel =125 meV and J_perp = 11 meV respectively and a spin-wave intensity renormalization Z_chi = 0.4.
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