Phys. Rev. B 72, 094425 (2005) [5 pages]Contribution of impurity-pinned vortices to the response function in a randomly diluted easy-plane ferromagnet on a square latticeReceived 7 June 2005; revised 4 August 2005; published 20 September 2005 Using spin dynamics techniques, we determine the neutron scattering function Sxx(q⃗,ω) of the two-dimensional classical XY model on a square lattice containing a percentage of nonmagnetic impurities on the magnetic sites. Dilution substantially transforms the shape and the position of the central and spin wave peaks. Besides the spin wave peak, an additional inelastic peak arises. We argue that the causes of this rich structure are vortex-vacancy interactions. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.094425
DOI:
10.1103/PhysRevB.72.094425
PACS:
75.10.Hk, 75.30.Hx, 75.40.Mg, 75.40.Gb
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