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

doi:10.1103/PhysRevB.77.020405

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

School of Arts and Sciences, Physics & Astronomy

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

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 language	English (US)
Article number	020405
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	77
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.77.020405
State	Published - Jan 10 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.77.020405

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title = "From cooperative paramagnetism to N{\'e}el order in Y2 Ru2 O7: Neutron scattering measurements",

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.",

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T1 - From cooperative paramagnetism to Néel order in Y2 Ru2 O7

T2 - Neutron scattering measurements

AU - Van Duijn, J.

AU - Hur, N.

AU - Taylor, J. W.

AU - Qiu, Y.

AU - Huang, Q. Z.

AU - Cheong, S. W.

AU - Broholm, C.

AU - Perring, T. G.

PY - 2008/1/10

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N2 - 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.

AB - 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.

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

Abstract

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