From cooperative paramagnetism to Neel order in Y2Ru2O7: neutron scattering measurements

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Title: From cooperative paramagnetism to Neel order in Y2Ru2O7: neutron scattering measurements
Author: van Duijn, J.; Hur, N.; Taylor, J.W.; Qiu, Y.; Huang, Q.Z.; Cheong, S.-W.; Broholm, C.; Perring, T.G.
Abstract: Spin correlations in the pyrochlore antiferromagnet Y2Ru2O7 with Curie-Weiss temperature ΘCW* - 1100 K and critical temperature TN = 77 K were examined through neutron scattering. For TN < T < ΘCW / 3 the data show spin relaxation with a rate ℎΓ = 1.17(9)kBT. For T<TN spectral weight moves to higher energies with substantial changes up to 4kBTN. For T << TN there is a Δ = 11(1) meV energy gap and a pronounced spectral maximum at 19.7 meV. Throughout the temperature range examined, the wave vector dependence of inelastic scattering exhibits a broad peak for Qd ≈ 3.8 (d is the Ru-Ru spacing) consistent with dipolar spin correlations.
URI: http://jhir.library.jhu.edu/handle/1774.2/33768
Date: 2008-01-01
Citation: Physical Review B (Condensed Matter and Materials Physics) 1 Jan. 2008, vol.77, no.2, pp. 020405-1-4
Subject: yttrium compounds
ruthenium compounds
neutron diffraction
paramagnetism
spin correlations
pyrochlore antiferromagnet
Curie-Weiss temperature
critical temperature
neutron scattering
spin relaxation
inelastic scattering
Neel temperature
magnetic susceptibility
energy gap
antiferromagnetic materials
temperature 77 K
temperature -1100 K
Y2Ru2O7

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