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Phys. Rev. B 70, 180404(R) (2004) [4 pages]

Spin-spin correlations in Yb2Ti2O7: A polarized neutron scattering study

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J. S. Gardner1,2, G. Ehlers3, N. Rosov2, R. W. Erwin2, and C. Petrovic1
1Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
2NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA
3SNS Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA

Received 30 July 2004; published 22 November 2004

Polarized neutron diffraction and neutron spin echo have been employed to investigate the low-temperature (T<2 K) magnetic correlations in the frustrated magnet Yb2Ti2O7. Several studies have reported a phase transition at 240 mK, however, the low-temperature phase is still under debate. It has been reported that Yb2Ti2O7 enters a frozen ferromagnetic phase, however, studies of the spin dynamics suggest otherwise. Our results conclusively rule out a frozen ferromagnetic state and confirm that the majority of the spin system continues to fluctuate below 240 mK.

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.180404
DOI:
10.1103/PhysRevB.70.180404
PACS:
75.25.+z, 75.40.Gb, 75.50.Lk, 75.50.Dd
 
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