From cooperative paramagnetism to Néel order in Y2 Ru2 O7: Neutron scattering measurements

J. Van Duijn, N. Hur, J. W. Taylor, Y. Qiu, Q. Z. Huang, S. W. Cheong, C. Broholm, T. G. Perring

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Abstract

Spin correlations in the pyrochlore antiferromagnet Y2 Ru2 O7 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 Γ=1.17(9) kB T. For T< TN spectral weight moves to higher energies with substantial changes up to 4 kB TN. 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.

Original languageEnglish (US)
Article number020405
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number2
DOIs
StatePublished - Jan 10 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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