Abstract

The magnetic ground-state of the pyrochlore material Hg2Ru2O7, which undergoes a metal to Mott insulator transition (MIT) at T=107K, was investigated using muon spin relaxation and neutron powder diffraction (both non-polarized and polarized) measurements. Unlike the expected behavior associated with a spin-singlet ground-state, these surprisingly revealed the onset of long-range magnetic ordering below the MIT.

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