Magnetic Ordering in the Spin-Ice Candidate Ho$_2$Ru$_2$O$_7$

Details Magnetic Ordering in the Spin-Ice Candidate Ho$_2$Ru$_2$O$_7$ Magnetic Ordering in the Spin-Ice Candidate Ho$_2$Ru$_2$O$_7$

2004-04-09

arxiv.org/abs/cond-mat/0404235v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures, submitted to Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.93.076403

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.

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