51. Magnetic Ordering in the Spin-Ice Candidate Ho$_2$Ru$_2$O$_7$
- Author
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Wiebe, C. R., Gardner, J. S., Kim, S. -J., Luke, G. M., Wills, A. S., Gaulin, B. D., Greedan, J. E., Swainson, I., Qiu, Y., and Jones, C.
- Subjects
Condensed Matter - Statistical Mechanics - Abstract
Neutron scattering measurements on the spin-ice candidate material Ho$_2$Ru$_2$O$_7$ have revealed two magnetic transitions at T $\sim$ 95 K and T $\sim$ 1.4 K to long-range ordered states involving the Ru and Ho sublattices, respectively. Between these transitions, the Ho$^{3+}$ moments form short-ranged ordered spin clusters. The internal field provided by the ordered S=1 Ru$^{4+}$ moments disrupts the fragile spin-ice state and drives the Ho$^{3+}$ moments to order. We have directly measured a slight shift in the Ho$^{3+}$ crystal field levels at 95 K from the Ru ordering., Comment: 4 pages, 5 figures, submitted to Phys. Rev. Letters
- Published
- 2004
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