Magnetic ordering in the spin-ice candidate Ho2Ru2O7.
Neutron scattering measurements on the spin-ice candidate material Ho2Ru2O7 have revealed two magnetic transitions at T approximately 95 and approximately 1.4 K to long-range ordered states involving the Ru and Ho sublattices, respectively. Between these transitions, the Ho3+ moments form short-ranged ordered spin clusters. The internal field provided by the ordered S=1 Ru4+ moments disrupts the fragile spin-ice state and drives the Ho3+ moments to order. We have directly measured a slight shift in the Ho3+ crystal field levels at 95 K from the Ru ordering.
Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada. cwiebe@brocku.ca
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Wiebe
J S
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Gardner
S-J
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Kim
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Luke
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Wills
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Gaulin
J E
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Greedan
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Swainson
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Qiu
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Jones